Gartner did something unusual in 2025: it killed a security category before most buyers had finished evaluating it. External Attack Surface Management, or EASM, got folded into a broader “Exposure Assessment Platforms” bucket and dropped from Gartner’s Hype Cycle for Security Operations that July, with the firm calling the standalone label “obsolete before mature.” That sounds like the category is dying. It isn’t. The tools that do the actual work, mapping every domain, IP, cloud bucket, and forgotten subdomain an organization owns, are more relevant than ever, and three products now dominate the buying conversation: Microsoft Defender EASM, CyCognito, and Tenable ASM.
The stakes are not abstract. Verizon’s 2026 Data Breach Investigations Report found that 69% of breaches trace back to an asset the security team didn’t know it had. A separate survey run for PR Newswire found 73% of cybersecurity leaders had experienced an incident tied directly to an unknown or unmanaged asset. And research cited by Brandefense in 2026 puts the average enterprise’s visibility into its own external footprint at just 62% of what actually exists. Put plainly: a third of most companies’ internet-facing infrastructure sits outside the view of the people responsible for defending it.
This comparison breaks down what Microsoft Defender EASM, CyCognito, and Tenable ASM actually do, how they price out at real scale, what independent benchmark data says about detection accuracy, and which one fits which kind of security team walking into the second half of 2026.
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What Attack Surface Management Actually Does
Attack surface management is the continuous process of finding every internet-facing asset an organization owns, including the ones nobody remembers deploying, and assessing which of them are exposed to attack. That’s a different job from vulnerability scanning, which checks known assets for known flaws, and a different job from EDR or XDR, which watches for malicious activity after an attacker is already inside. ASM operates before either of those, answering a simpler but harder question: what do we actually have, and can someone outside the company find it?
The market splits into two related disciplines. EASM (External Attack Surface Management) maps what an attacker sees from the outside: domains, subdomains, IP ranges, cloud storage buckets, exposed APIs, SSL certificates, and shadow IT spun up by a marketing team or an acquired subsidiary nobody fully integrated. CAASM (Cyber Asset Attack Surface Management) instead aggregates data from internal sources, like CMDBs, cloud inventories, and endpoint agents, to build a unified asset inventory from the inside out. Microsoft Defender EASM, CyCognito, and Tenable ASM all lead with external discovery, though Tenable and CyCognito both layer in internal asset correlation through their broader platforms, Tenable One and the CyCognito Platform respectively.
How Discovery Actually Works Under the Hood
All three platforms pull from a similar set of raw data sources, then differentiate on how well they correlate and validate what comes back. Certificate transparency logs reveal every SSL certificate ever issued for a domain, including ones for subdomains a security team forgot existed. Passive DNS records show historical domain-to-IP mappings that expose infrastructure even after it’s been reconfigured. WHOIS and reverse WHOIS data link registration details back to a parent organization, which is how a tool spots a subsidiary’s domain even without an obvious naming pattern. Cloud provider APIs, where a customer grants read access, add authoritative visibility into storage buckets, load balancers, and compute instances that pure internet crawling might miss entirely. BGP routing data and internet-wide port scanning round out the picture, showing which IP ranges an organization actually announces and which ports sit open on them.
The differentiator isn’t access to these sources, since they’re broadly available to any vendor willing to build the crawling infrastructure. It’s what happens after collection: how aggressively a platform correlates weak signals into a confirmed asset, how it avoids false attribution (flagging someone else’s server as yours), and whether it stops at “this looks exposed” or goes further and safely confirms the exposure is real.
Why This Matters More in 2026
Two forces are pushing ASM up the priority list this year. First, cloud sprawl and SaaS adoption keep expanding the perimeter faster than IT teams can inventory it, a pattern Palo Alto’s Cortex Xpanse research describes as the average SaaS company carrying roughly three times more exposed assets than its security team is aware of. Second, mergers and acquisitions routinely import unmanaged infrastructure wholesale. When a company acquires a smaller firm, it inherits every domain, forgotten dev server, and misconfigured storage bucket that came with it, often without a clean asset list to work from. Attack surface management tools exist to close that gap continuously, not as a one-time audit.
A third, quieter driver is regulatory pressure. Cyber-insurance underwriters increasingly request evidence of continuous external monitoring before issuing or renewing a policy, and frameworks like SOC 2 and ISO 27001 expect a documented, current asset inventory rather than a spreadsheet last updated during the previous audit cycle. Security teams that couldn’t previously justify an ASM line item to finance now have a compliance-driven reason to buy one.
Meet the Three Contenders
Each of these three products approaches discovery differently, and each is built for a different kind of buyer.
Microsoft Defender External Attack Surface Management
Microsoft Defender EASM grew out of the RiskIQ acquisition and runs as an Azure resource inside a customer’s tenant. It crawls the open internet the way Microsoft’s own security research infrastructure does, building an inventory of domains, hosts, and IP blocks tied to an organization, then feeds that inventory into Defender XDR and Sentinel for correlation with the rest of a Microsoft-centric security stack. The pitch is straightforward: if a team already runs Defender and Sentinel, EASM slots in without adding a new vendor relationship, a new console, or a new data-sharing agreement.
CyCognito
CyCognito built its name on combining discovery with active security testing, meaning it doesn’t just find an exposed asset, it attempts to validate the risk against it using safe, non-destructive techniques. The platform is positioned for large, distributed enterprises, especially ones with a history of acquisitions, subsidiaries, or business units that operate their own infrastructure outside central IT’s line of sight. CyCognito’s own materials describe its strength as AI-driven attribution, the ability to correctly tie an obscure asset back to the parent organization even when there’s no obvious naming convention linking them, which is exactly the kind of shadow IT that spreadsheet-based inventories miss.
Tenable Attack Surface Management
Tenable ASM extends the company’s long-standing vulnerability management business into external discovery, then unifies the results inside Tenable One, its broader exposure management platform. That makes it the natural pick for organizations that already run Tenable Vulnerability Management for internal scanning and want external asset data flowing into the same risk-scoring engine rather than a separate tool. The trade-off is that Tenable ASM is rarely bought on its own. It’s typically part of a Tenable One bundle, which is a benefit for existing customers and friction for anyone trying to buy it standalone.
Other ASM Vendors Worth a Look
Microsoft Defender EASM, CyCognito, and Tenable ASM aren’t the only names in this market, and a handful of adjacent players show up often enough in research and case studies that they deserve a mention before diving into the head-to-head comparison.
- Palo Alto Networks Cortex Xpanse: Palo Alto’s attack surface testing capability goes further than passive discovery by actively attempting benign versions of real exploits against exposed services, and a published customer case study credits it with a 95% reduction in external vulnerability management spend. It’s the strongest fit for organizations already standardized on Palo Alto’s Cortex ecosystem, similar to how Defender EASM fits Microsoft shops.
- Censys: Best known for its internet-wide scanning research, Censys EASM leans on the same certificate transparency and port-scanning data described above, and a Forrester Total Economic Impact study documented a 70% drop in false positives and 10,000 newly discovered assets in one deployment. It tends to appeal to research-oriented security teams that want raw data access alongside the finished product.
- Recorded Future Attack Surface Intelligence: Recorded Future layers its threat intelligence feeds on top of asset discovery, which means findings arrive already contextualized against active threat actor behavior rather than as a flat list of exposures. Customers reported a 29% improvement in asset visibility and a 51% reduction in vulnerable attack surface within the first year.
- Rapid7 Surface Command: Rapid7 folds external discovery into its broader InsightVM and Command platform lineup, giving it a similar unified-exposure pitch to Tenable’s, and Rapid7’s own research claims up to a 30% reduction in major data breach incidents tied to uncovering previously unprotected assets.
None of these four displaces the three lead contenders in this comparison for most buyers, largely because each ties most tightly into its own broader platform (Cortex, threat intelligence, or InsightVM) the same way Microsoft, CyCognito, and Tenable do. But any shortlist process worth running should include at least one of them as a reference point, especially Cortex Xpanse for teams weighing active-testing depth against CyCognito.
Specs Comparison: Defender EASM vs CyCognito vs Tenable ASM
The table below lines up the core technical and commercial differences across all three platforms, based on vendor documentation and third-party pricing research current as of August 2026.
| Attribute | Microsoft Defender EASM | CyCognito | Tenable ASM |
|---|---|---|---|
| Discovery method | RiskIQ-based internet crawling | AI-driven attribution and active testing | Extends Tenable’s scanning engine to external assets |
| Deployment model | Azure resource, per-tenant workspace | Cloud SaaS platform | Part of Tenable One, cloud-hosted |
| Pricing model | Consumption-based, per billable asset per day | Annual, asset-tier based | Bundled into Tenable One; quote-based standalone |
| Lowest published price point | ~$0.011 to $0.017 per asset/day | $30,000/year for 250 assets (ASM 250 tier) | Not publicly listed |
| Native SIEM/XDR integration | Deep, Defender XDR and Sentinel | Vendor-agnostic via API and connectors | Tenable One (Nessus, Tenable VM, Tenable Cloud Security) |
| Active exploit testing | Limited, primarily passive discovery | Yes, safe/non-destructive validation | Limited, primarily passive discovery |
| Best-fit ecosystem | Microsoft 365/Azure/Defender shops | Large distributed enterprises, M&A-heavy orgs | Existing Tenable Vulnerability Management customers |
| Shadow IT / subsidiary discovery | Moderate | Strong, purpose-built for this | Moderate |
| CAASM (internal asset correlation) | Via Defender ecosystem | Limited standalone | Strong, via Tenable One |
| Free trial available | Yes, 30-day Azure trial | Custom demo/POV, no self-serve trial | Custom demo/POV, no self-serve trial |
| Typical buyer size | SMB to large enterprise | Mid-market to large enterprise | Mid-market to large enterprise |
| G2 rating (2026 roundups) | 4.3/5 | 4.3/5 | 4.4/5 (Tenable One) |
The pattern that jumps out is ecosystem gravity. None of these three tools wins on raw discovery technology alone, since all three crawl the same public internet and pull from overlapping data sources like certificate transparency logs and DNS records. What actually separates them is which platform the results land in afterward, and that’s usually the deciding factor for a buyer who already has a security stack in place.
Pricing Breakdown: The 19x Gap
Pricing transparency across ASM vendors is poor, which is itself worth flagging before comparing numbers. Most vendors quote custom pricing tied to asset count, and few publish a rate card. Two data points, however, are public enough to compare directly, and the gap between them is significant.
| Vendor | Published pricing | Est. annual cost at 250 assets | Billing basis |
|---|---|---|---|
| Microsoft Defender EASM | ~$0.011 to $0.017 per billable asset/day | ~$1,000 to $1,550 | Consumption, daily accrual |
| CyCognito | $30,000/year (ASM 250 tier) | $30,000 | Flat annual, asset-tier |
| Tenable ASM | Quote-based, no public list price | Not disclosed | Bundled in Tenable One |
At 250 tracked assets, Microsoft’s consumption pricing lands somewhere between $1,000 and $1,550 a year, while CyCognito’s only published tier costs $30,000 a year for the same asset count. That’s roughly a 19x price gap between the cheapest and most expensive publicly quoted options, before either vendor applies enterprise discounting or volume pricing that would only show up in a real sales quote. Tenable sits outside this comparison entirely because it doesn’t publish EASM-specific pricing, choosing instead to fold the capability into Tenable One’s broader exposure management bundle, where cost depends on the mix of vulnerability management, cloud security, and identity exposure modules a customer buys alongside it.
The gap isn’t purely apples-to-apples. Microsoft’s per-asset-per-day model rewards organizations with lean, well-managed inventories and punishes ones with sprawling, uncontrolled footprints, since every discovered asset accrues daily charges whether or not it’s actually a risk. CyCognito’s flat annual tier, by contrast, includes active testing and human-assisted validation that Microsoft’s passive crawler doesn’t attempt, which is a meaningful part of what that premium buys. Buyers comparing the two should weigh cost per asset against cost per validated finding, not just the sticker price.
The math shifts as asset counts climb, and it’s worth running before signing a contract. A quick estimate for a mid-size enterprise tracking 1,000 external assets, using the low end of Microsoft’s published per-asset-per-day rate, looks like this:
Microsoft Defender EASM (1,000 assets):
1,000 assets x $0.011/day x 365 days = $4,015/year
CyCognito (1,000 assets, custom quote required):
No public per-asset rate above the 250-asset tier;
vendor roundups place large-enterprise deals well into
six figures annually once active testing and support
tiers are included.
Tenable ASM (1,000 assets):
Priced as part of Tenable One; ask for a quote that
itemizes the EASM module separately from vulnerability
management and cloud security modules.Microsoft’s cost scales linearly and predictably with asset count, which makes budgeting simple but means a genuinely sprawling estate, the kind CyCognito is built to untangle, can still add up. CyCognito’s pricing, by contrast, doesn’t scale linearly in any published way past the entry tier, which is exactly why every serious evaluation should end with a real quote rather than an extrapolation from the $30,000 published rate.
Benchmark Data: Detection Accuracy and False Positives
Independent, apples-to-apples benchmarks across all three vendors don’t exist yet, which is a real limitation of this still-maturing category. What does exist is a set of vendor-commissioned but methodologically documented studies that give a useful, if partial, picture of real-world performance.
- Censys, via a Forrester Total Economic Impact study: the deployment discovered 10,000 previously unknown assets, equal to 50% of the organization’s total known asset count, while cutting false positives by 70%.
- Palo Alto Networks Cortex Xpanse (Attack Surface Testing): a documented customer case study reported a 95% reduction in external vulnerability management spend, near-zero false positives because findings are validated against benign versions of real exploits rather than flagged heuristically, and roughly 3 hours saved per confirmed vulnerability.
- Recorded Future Attack Surface Intelligence: customers using the platform reported a 29% improvement in asset visibility and a 51% reduction in vulnerable attack surface within the first year of deployment.
None of these three studies covers Microsoft Defender EASM, CyCognito, or Tenable ASM directly, but they establish a credible range for what a well-implemented ASM program should deliver: discovery lifts in the 30 to 50% range against prior asset counts, and false-positive reductions between 50% and 95% depending on whether the platform performs active validation or relies on passive signals alone. Active-testing platforms like CyCognito and Cortex Xpanse consistently post the strongest false-positive numbers in published research, which tracks with the underlying methodology difference described in the specs table above.
False positives matter more in this category than in most other security tooling because ASM findings almost always land on someone’s desk who isn’t a security specialist, often a developer or IT admin asked to confirm whether a flagged asset is really theirs. A high false-positive rate doesn’t just waste analyst time, it burns credibility with the business units that get pinged about assets that turn out to belong to someone else entirely, or that were already decommissioned months earlier and simply hadn’t dropped out of DNS caching yet. That’s the practical reason active-testing platforms command a price premium over passive crawlers: every confirmed finding a passive tool misclassifies costs real organizational trust, not just analyst hours.
Market Size and Where the Category Is Headed
Analyst estimates for the ASM market vary widely depending on whether a firm measures the broad ASM category or EASM specifically, and depending on what adjacent spending gets bundled in. That inconsistency is itself a signal of a market still settling on its own definition.
| Source | 2026 market size | Growth rate (CAGR) | Scope |
|---|---|---|---|
| Straits Research | $2.29B | 27.7% (2026-2034) | Broad ASM |
| Fortune Business Insights | $1.25B | 21.03% (through 2034) | Broad ASM |
| Outpost24 (EASM-specific) | $930.7M (est.) | ~17.5% (2022-2026) | EASM only |
Whichever figure a reader trusts most, every published estimate agrees on direction: this is a fast-growing category, expanding faster than the broader $240 billion cybersecurity market it sits inside. The spread between $930 million and $2.29 billion reflects analysts drawing the category boundary differently, some counting only pure-play EASM tools, others rolling in adjacent capabilities like CAASM and exposure management that Microsoft, CyCognito, and Tenable are all racing to bundle in anyway.
Where Gartner and Forrester Stand on ASM in 2026
Analyst coverage of this category shifted meaningfully over the past year, and it’s worth understanding before trusting any vendor’s “leader” claim. Gartner folded standalone EASM into its broader Exposure Assessment Platforms category in the 2025 Magic Quadrant cycle and removed EASM and CAASM as distinct entries from its Hype Cycle for Security Operations in July 2025. That doesn’t mean Gartner thinks the technology is unimportant. It means the firm no longer sees external discovery as a category that survives on its own, separate from the broader exposure management and continuous threat exposure management trend it now sits under.
Forrester took a different path, publishing its inaugural Forrester Wave for Attack Surface Management in Q3 2024 and treating ASM as a standalone evaluation category rather than merging it upward. As of this writing, no updated 2025 or 2026 ASM-specific Wave has followed, leaving the 2024 evaluation as the most recent formal analyst ranking available for buyers who want a structured comparison beyond vendor marketing.
The practical takeaway for buyers: don’t lean too heavily on category labels when shopping. Ask each vendor to demonstrate discovery against your own domains during a proof-of-value engagement instead of relying on quadrant placement that may already be a year out of date by the time you’re reading it. Analyst reports are a useful starting shortlist, not a substitute for testing a tool against your own environment, especially in a category where the underlying data sources are similar across vendors and the real differentiation shows up only in how well each platform correlates and validates what it finds.
Real-World Examples: When ASM Catches What Nothing Else Does
ASM earns its budget line in specific, recurring scenarios rather than as a generic nice-to-have. Five patterns show up repeatedly across the research and case studies referenced above.
- Post-acquisition asset sprawl. A newly acquired subsidiary brings its own domains, cloud accounts, and dev environments that rarely appear in the acquiring company’s CMDB on day one. Integration teams typically focus first on financial systems and email migration, leaving infrastructure inventory as an afterthought that can take months to reconcile manually. CyCognito’s attribution model is built specifically to link these orphaned assets back to the parent organization even without a shared naming convention, which matters most in the first 90 days after a deal closes, when the combined attack surface is at its messiest and least documented.
- Shadow IT from business units. Marketing spins up a campaign microsite on a vendor’s hosting platform, forgets to decommission it after the campaign ends, and it sits exposed with an outdated CMS for years. Sales teams do the same with demo environments, and product teams do it with staging APIs left reachable from the public internet long after a feature ships. External crawling catches this class of asset that internal CMDBs never captured in the first place, because nobody outside the business unit that created it ever knew to log it.
- Cloud migration drift. As teams move workloads to Azure or AWS, temporary staging environments and forgotten storage buckets often stay reachable from the public internet after the real migration is declared complete. A load balancer stood up for a six-week migration test can quietly outlive the project by years if nobody owns tearing it down. Microsoft Defender EASM’s tight Azure integration makes it a natural fit for catching this inside Microsoft-heavy environments specifically, since it can cross-reference discovered assets against the tenant’s actual resource inventory.
- Third-party and supply chain exposure. Vendors and contractors sometimes stand up infrastructure under an organization’s brand or subdomain for integration purposes, then leave it live after the project wraps. A marketing agency’s landing page builder, a payment processor’s white-labeled checkout flow, or a staffing vendor’s applicant portal can all carry an organization’s name while sitting entirely outside its security team’s control. Continuous discovery, rather than a point-in-time audit, is the only way to reliably catch this drift as vendor relationships change.
- Compliance and cyber-insurance requirements. Insurers increasingly ask for evidence of continuous external monitoring before underwriting a policy, and auditors under frameworks like SOC 2 and ISO 27001 expect a documented, current asset inventory rather than an annual spreadsheet exercise. Renewal conversations with cyber-insurance carriers now routinely include a request for an ASM vendor’s export showing the current external footprint, and a growing number of carriers offer premium discounts tied directly to continuous monitoring coverage.
The through-line across all five is time. A one-time penetration test or annual audit catches a snapshot. Continuous ASM catches what changed since last Tuesday, which is exactly the window attackers exploit, since automated scanning tools find newly exposed infrastructure within hours of it going live.
Which Tool Fits Which Team
The right choice depends less on feature checklists and more on what a team already runs and how it operates.
- Microsoft-centric security teams: Defender EASM is the default answer for organizations already standardized on Defender XDR and Sentinel, since findings flow directly into existing incident response workflows without a new console to learn.
- Large enterprises with M&A activity or many subsidiaries: CyCognito’s attribution engine is purpose-built for exactly this kind of sprawling, loosely connected asset landscape, and the active-testing approach reduces the alert fatigue that a large, multi-brand estate would otherwise generate.
- Existing Tenable Vulnerability Management customers: Tenable ASM makes the most financial and operational sense here, since it plugs external discovery directly into a risk-scoring workflow the team already uses for internal scanning, avoiding a second, disconnected risk register.
- Budget-constrained SMBs and lean security teams: Microsoft’s consumption-based pricing scales down cleanly for a smaller footprint, making it the more accessible entry point for a team with a few hundred assets and no dedicated ASM budget line.
- MSSPs and consultancies running assessments across many client environments: CyCognito’s or Tenable’s ability to segment and report per-organization tends to fit multi-tenant use better than a single-tenant Azure workspace model, since consultancies need clean separation between client data sets.
Migration Guide: Adopting or Switching ASM Platforms
Whether a team is standing up its first ASM program or switching from one vendor to another, the same rough sequence applies. Here’s a practical path that avoids the most common early mistakes.
- Inventory known seed data first. Before turning on any crawler, compile every domain, IP range, and cloud account the security team already knows about. This becomes the baseline against which newly discovered assets get measured, and it’s the fastest way to spot a vendor’s false-positive rate during a trial.
- Run a proof-of-value against real infrastructure. Insist on a 2-4 week trial against your actual domains rather than a vendor demo environment. Compare what each platform surfaces against your seed list from step one.
- Check integration depth with your SIEM/SOC workflow. Findings that don’t flow into the ticketing or alerting system a SOC already uses tend to get ignored. Confirm the vendor’s connector to your existing SIEM, whether that’s Sentinel, Splunk, or another platform, before committing.
- Assign clean asset ownership before go-live. ASM tools generate noise fast if there’s no process to triage a new finding within 24-48 hours. Assign a named owner per business unit before the platform starts surfacing results in volume.
- Set a remediation SLA tied to exposure severity. A critical, internet-facing finding should have a different response window than a low-severity informational one. Define these tiers before the first scan completes, not after the backlog builds up.
- Run legacy and new tools in parallel for one cycle. If migrating from a spreadsheet-based process or a competing vendor, run both side by side for at least one full discovery cycle before decommissioning the old process, to confirm nothing gets lost in the transition.
- Decommission the old system only after a full audit cycle confirms parity. Compare the finding counts, asset counts, and false-positive rates between old and new before fully cutting over.
Teams that skip the proof-of-value step most often end up disappointed six months in, discovering that a platform’s discovery breadth didn’t match their actual environment. A short trial against real domains costs little and prevents a year-long contract mismatch. It’s also worth budgeting time for the human side of the rollout separately from the technical setup. The tooling itself typically takes days to configure, but getting business units to respond to their first round of findings, especially ones from teams that didn’t know an ASM program existed until an email showed up about a forgotten microsite, usually takes longer and benefits from an internal communication plan sent out before the first scan runs.
Pros and Cons
Microsoft Defender EASM
Pros: Tight native integration with Defender XDR and Sentinel, consumption pricing that scales down well for smaller footprints, and a 30-day free trial that lowers the barrier to a first look. Cons: Consumption billing can become unpredictable for organizations with sprawling, poorly governed asset counts, active exploit testing is limited compared to CyCognito or Cortex Xpanse, and the tool delivers the least value outside a Microsoft-centric security stack.
CyCognito
Pros: Strong attribution for shadow IT and orphaned subsidiary assets, active safe testing that meaningfully cuts false positives, and vendor-agnostic integration that doesn’t lock a buyer into one security ecosystem. Cons: The only public pricing tier, $30,000 a year for 250 assets, is expensive relative to Microsoft’s consumption model, CAASM-style internal asset correlation is comparatively limited, and there’s no self-serve trial, meaning every evaluation runs through a sales cycle.
Tenable ASM
Pros: Unifies external and internal exposure data inside Tenable One, strong fit for existing Tenable Vulnerability Management customers, and solid CAASM-style internal correlation as part of the broader platform. Cons: No public standalone pricing makes budgeting difficult without a sales conversation, it’s rarely available outside a Tenable One bundle, and active exploit validation trails what CyCognito and Cortex Xpanse offer.
The Verdict: Which ASM Tool Should You Choose in 2026
There’s no single winner here, and the data backs that up. For a Microsoft-standardized security team, Defender EASM’s near-$1,000-a-year entry cost at 250 assets and native Sentinel integration make it the obvious first stop, especially with a free 30-day trial removing the risk of a wrong first bet. For a large, acquisitive enterprise juggling subsidiaries and shadow IT that a passive crawler will never fully attribute, CyCognito’s $30,000-a-year premium buys attribution accuracy and active validation that a budget tool can’t match, and the 70% false-positive reduction Forrester documented for a comparable active-testing platform explains why security teams pay it. For anyone already running Tenable Vulnerability Management, extending into Tenable ASM through Tenable One avoids running two disconnected risk registers, even without a published standalone price to compare against the other two.
The bigger lesson sits above any single vendor choice. With 69% of breaches tracing back to unknown assets and the average organization seeing only 62% of its real external footprint, the question for most security teams in 2026 isn’t which ASM tool to buy. It’s how quickly they can stand one up before the next unmanaged asset becomes the next incident report.
Frequently Asked Questions
What is the difference between EASM and vulnerability management?
Vulnerability management scans assets a team already knows about for known flaws. EASM finds the assets a team doesn’t know it has in the first place. They’re complementary, not competing, disciplines, which is why Tenable and Microsoft both bundle EASM findings into their broader vulnerability management platforms rather than selling it as an isolated tool.
Is Microsoft Defender EASM included with Microsoft 365 E5?
No. Defender EASM is a separate Azure resource billed on consumption, charged per billable asset per day, and is not bundled into Microsoft 365 E5 or Defender XDR licensing. It requires its own workspace and its own line item, though it does integrate tightly with tools included in those bundles.
Does CyCognito replace a vulnerability scanner?
Not entirely. CyCognito focuses on external discovery and active validation of internet-facing exposures, but most organizations still run an internal vulnerability scanner like Nessus or Qualys for assets behind the firewall that CyCognito’s external crawling won’t reach.
Can Tenable ASM be purchased without the rest of Tenable One?
Tenable does not publish a standalone ASM price, and in practice the capability is sold as part of the Tenable One exposure management bundle rather than as an isolated product. Organizations interested only in external discovery, without the broader Tenable One suite, are typically better served by Microsoft Defender EASM or CyCognito.
Why did Gartner remove EASM from its Hype Cycle?
Gartner folded EASM into a broader Exposure Assessment Platforms category in its 2025 research and dropped the standalone label from its Hype Cycle for Security Operations in July 2025. The move reflects consolidation, where vendors increasingly bundle EASM into wider exposure management platforms, rather than a judgment that the underlying technology has lost value.
How long does it take to see results after deploying an ASM tool?
Initial discovery typically completes within the first 24-72 hours of onboarding, surfacing a first-pass asset inventory quickly. Meaningful risk reduction, measured by findings triaged and remediated, generally takes 60-90 days as teams build out ownership and remediation workflows around the new findings.
What’s a realistic budget for a mid-market company evaluating ASM?
Based on the published pricing in this comparison, a mid-market organization tracking a few hundred external assets should expect a range from roughly $1,000 to $2,000 a year on the low end with Microsoft’s consumption model, up to $30,000 or more a year for an active-testing platform like CyCognito, with Tenable ASM landing somewhere in between depending on the Tenable One bundle configuration.
Does ASM cover cloud misconfigurations too?
Partially. ASM tools discover exposed cloud assets like open storage buckets and misconfigured load balancers when they’re reachable from the public internet, but deep configuration auditing of a cloud environment is typically handled by a dedicated CSPM tool. Many teams run both together, feeding ASM’s discovery into the CSPM’s deeper configuration checks.
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