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Microsoft Defender External Attack Surface Management vs Tenable Attack Surface Management comparison

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Comparison Buyer's Guide

Executive Summary

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Categories and Ranking

Microsoft Defender External...
Ranking in Attack Surface Management (ASM)
16th
Average Rating
7.6
Reviews Sentiment
6.0
Number of Reviews
2
Ranking in other categories
Microsoft Security Suite (33rd)
Tenable Attack Surface Mana...
Ranking in Attack Surface Management (ASM)
7th
Average Rating
10.0
Reviews Sentiment
9.3
Number of Reviews
1
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of October 2026, in the Attack Surface Management (ASM) category, the mindshare of Microsoft Defender External Attack Surface Management is 2.9%, down from 3.7% compared to the previous year. The mindshare of Tenable Attack Surface Management is 2.2%, down from 5.6% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Attack Surface Management (ASM) Mindshare Distribution
ProductMindshare (%)
Tenable Attack Surface Management2.2%
Microsoft Defender External Attack Surface Management2.9%
Other94.9%
Attack Surface Management (ASM)
 

Featured Reviews

AndyChan3 - PeerSpot reviewer
General manager at a tech services company with 201-500 employees
Enhanced visibility and exposes vulnerabilities but needs more integration
I am currently in the pilot stage of implementing Microsoft External Attack Surface Management (EASM). My organization is transitioning to a comprehensive track of Microsoft solutions, and we will move to full-scale production in another year, maybe Microsoft External Attack Surface Management…
SR
Information Resources Coordinator - Application at PowerGen
Continuous monitoring has provided assurance and real‑time visibility into our OT environment security
The best features that Tenable Attack Surface Management offers are its easy availability and usability. The interface and dashboard give us the information at a glance, and it is easy to use with respect to learnability. We are satisfied with the product. Tenable Attack Surface Management dashboard provides important information at a glance. As soon as a user logs in, it provides information that can be used immediately for troubleshooting or analyzing. Tenable Attack Surface Management dashboard is very helpful, easy to set up, and gives all the information at a glance once you log in. Tenable Attack Surface Management governance and security give the user control to take action. It gives the user the ability to understand the alert and determine the appropriate action. Tenable Attack Surface Management accuracy and reliability of output is great. It flags the smallest threat or the smallest anomaly that it sees and gives a proper diagnosis of the anomaly. It gives the user the ability to determine if this is a false positive or a true attack with respect to what is going on in the OT environment.
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Top Industries

By visitors reading reviews
Outsourcing Company
13%
Computer Software Company
10%
Financial Services Firm
9%
Comms Service Provider
6%
Government
10%
Construction Company
9%
Manufacturing Company
8%
Performing Arts
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
No data available
 

Questions from the Community

What needs improvement with Microsoft Defender External Attack Surface Management?
Further integration across different Microsoft products would be an improvement. Introduction of more AI automation into the products would also be beneficial. The integration is not as seamless co...
What is your primary use case for Microsoft Defender External Attack Surface Management?
I am currently in the pilot stage of implementing Microsoft External Attack Surface Management (EASM). My organization is transitioning to a comprehensive track of Microsoft solutions, and we will ...
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Also Known As

No data available
Tenable.asm
 

Overview

Find out what your peers are saying about TrendAI, Qualys, BitSight and others in Attack Surface Management (ASM). Updated: September 2026.
915,287 professionals have used our research since 2012.