HEAD TO HEAD · SCORED SEPTEMBER 2026 · CROWDSTRIKE EASM ADDED 13 OCTOBER 2026
Tenable ASM vs Microsoft Defender EASM: attack surface management compared
Quick answer
Tenable ASM scores 6.05 to Microsoft Defender EASM's 6.00 on our weights, a gap of 0.05. Tenable ASM leads on exploitability validation, remediation and integrations; Microsoft Defender EASM leads on attribution, time to value and pricing transparency. They tie on discovery.
Scored September 2026 · CrowdStrike EASM added 13 October 2026 · Drawn from vendor product pages, docs and public pricing
How do Tenable ASM and Microsoft Defender EASM compare on each criterion?
| Criterion | Weight | Tenable ASM | Microsoft Defender EASM | Winner |
|---|---|---|---|---|
| Discovery of unknown assets and subsidiaries | 20% | 7 | 7 | Tie |
| Attribution accuracy and false-positive handling | 15% | 6 | 7 | Microsoft Defender EASM |
| Exploitability validation | 15% | 5 | 3 | Tenable ASM |
| Remediation and mitigation support | 20% | 6 | 4 | Tenable ASM |
| Integrations and platform reach | 10% | 9 | 8 | Tenable ASM |
| Time to value | 10% | 6 | 8 | Microsoft Defender EASM |
| Pricing transparency | 10% | 3 | 7 | Microsoft Defender EASM |
Tenable ASM leads on 3 criteria, Microsoft Defender EASM on 3, 1 tied. Weighted: Tenable ASM 6.05, Microsoft Defender EASM 6.00.
What does a finding arrive with in each?
Tenable ASM
- Owner or subsidiary attributedNot documented
- Exploitability provenNot documented
- Ticket or workflow createdPartial
- Compensating control appliedPartial
- Fix retestedNot documented
Microsoft Defender EASM
- Owner or subsidiary attributedPartial
- Exploitability provenNot documented
- Ticket or workflow createdPartial
- Compensating control appliedNot documented
- Fix retestedNot documented
Where does each one win?
Tenable ASM wins on
Exploitability validation: 5 vs 3
Tenable One adds attack path analysis across 150+ techniques; the ASM product itself does not document exploit testing.
Remediation and mitigation support: 6 vs 4
Tenable One's Hexa AI engine orchestrates automated remediation workflows, which requires buying into Tenable One.
Integrations and platform reach: 9 vs 8
Feeds Tenable One alongside vulnerability, cloud, OT and identity exposure data, with Tenable One Connectors for third-party sources.
Microsoft Defender EASM wins on
Attribution accuracy and false-positive handling: 7 vs 6
Every asset carries a state (Approved Inventory, Dependency, Monitor Only, Candidate, Requires Investigation) based on connection strength and confidence.
Time to value: 8 vs 6
30-day free trial on the first resource, plus the prebuilt inventory.
Pricing transparency: 7 vs 3
Self-serve Azure billing against a published definition of billable assets (approved hosts, domains and IP addresses) after the trial.
Tied: Discovery of unknown assets and subsidiaries (7).
How do Tenable ASM and Microsoft Defender EASM price?
| Item | Tenable ASM | Microsoft Defender EASM |
|---|---|---|
| Pricing | ASM: quote only. Tenable publishes prices for some adjacent products. | Billed through Azure on billable assets (approved host:IP combinations, domains and IP addresses) after a 30-day free trial. See Microsoft's pricing page for the current rate. |
| Deployment | SaaS, part of Tenable One | Azure resource (SaaS) |
| Pricing transparency score | 3 | 7 |
Prices and pricing bases as published by each vendor and reviewed in September 2026. 'Not published' means we did not find it on the vendor's public pages.
Should you choose Tenable ASM or Microsoft Defender EASM?
Choose Tenable ASM if
- The tool has to fit a wider security platform or many existing tools. Tenable ASM scores 9 on integrations: Feeds Tenable One alongside vulnerability, cloud, OT and identity exposure data, with Tenable One Connectors for third-party sources.
- Finding unknown assets, subsidiaries and acquired infrastructure is your main gap. Tenable ASM scores 7 on discovery: Draws on an attack surface map of more than 5 billion assets to identify domains related to the buyer's inventory.
Choose Microsoft Defender EASM if
- You want results with the least setup. Microsoft Defender EASM scores 8 on time to value: 30-day free trial on the first resource, plus the prebuilt inventory.
- The tool has to fit a wider security platform or many existing tools. Microsoft Defender EASM scores 8 on integrations: Data connectors to Log Analytics and Azure Data Explorer and a Security Copilot integration in preview; no cross-tenant resource access.
On our default weights Tenable ASM comes out ahead. Change the weights in the score calculator to see whether that holds for your priorities.
Frequently asked questions
Is Tenable ASM better than Microsoft Defender EASM?
On our weights Tenable ASM scores higher, 6.05 to 6.00. Tenable ASM leads on 3 criteria and Microsoft Defender EASM on 3 criteria, with 1 tied. The better choice depends on which criteria matter most to you; the score calculator lets you change the weights.
What do Tenable ASM and Microsoft Defender EASM cost?
Tenable ASM: ASM: quote only. Tenable publishes prices for some adjacent products. Microsoft Defender EASM: Billed through Azure on billable assets (approved host:IP combinations, domains and IP addresses) after a 30-day free trial. See Microsoft's pricing page for the current rate.
Which one does more to help fix exposures?
Tenable ASM scores 6 on remediation and mitigation support against 4 for Microsoft Defender EASM. Tenable ASM: Tenable One's Hexa AI engine orchestrates automated remediation workflows, which requires buying into Tenable One.
Sources: Attack Surface Management, Tenable One, Buy, Overview, What is discovery, Billable assets, Data connections, Pricing · Reviewed September 2026