Microsoft Defender External Attack Surface Management vs. Tenable Vulnerability Management

Microsoft Defender External Attack Surface Management is particularly well-suited for discovering, inventorying, and continuously monitoring the external attack surface, especially in environments with heavy Microsoft adoption. It is less suitable as a standalone solution for internal scanning, real-time attack detection, automated remediation, or advanced application testing. Microsoft Defender External Attack Surface Management es especialmente adecuado para descubrir, inventariar y monitorear continuamente la superficie de ataque externa, sobre todo en entornos con fuerte adopción de Microsoft. Es menos adecuado como solución única para escaneo interno, detección de ataques en tiempo real, remediación automática o pruebas avanzadas de aplicaciones. Parts of this review were originally written in Spanish and have been translated into English using a third-party translation tool. While we strive for accuracy, some nuances or meanings may not be perfectly captured.

Incentivized

I've been using this product since it began as an open source product, I really like it and for the money, I think it's probably the best choice for most companies who need a product like this. Over the years I've seen the interface change quite a bit and sometimes I think it's a bit unclear how to do certain things and the different packages can be confusing, these are the only reasons I'm giving it a 9 instead of a 10.

Incentivized

• Lack of visibility of external assets
• Reduction of the risk of external attacks
• Falta de visibilidad de activos externos
• Reducción del riesgo de ataques externos

Incentivized

• Setup of the internal scanner was fairly simple and straight forward.
• An update came out for the internal scanner that allows you to add an Internal Certificate Authority for lookup.
• Has automated reporting to keep executives and compliance departments informed.
• Internal scanner can be configured to auto-update itself.
• "Recast Rules" allows your organization to redefine a vulnerabilities' classification, if it is not applicable or your disagree.
• External PCI scans allow you to remediate before submitting to Tenable.io for review.
• Tenable.io staff was very patient and helpful. They provided some limited guidance with remediation.
• Internal and External scans can be automated. schedule for the automated scans is very granular.

Incentivized

• Asset Attribution and Ownership Clarity
• Risk Prioritization and Business Context
• Noise and False Positives

Incentivized

• Expensive - You do pay a slight premium for the best product in the space.
• Asset management is difficult to work with if you have a lot of asset turnover, the license can be ''held'' for 3-6 months after the asset is gone from your environment.

Incentivized

We like to renew tenable each year we have had it so far.

Incentivized

We rate Microsoft Defender External Attack Surface Management’s overall usability as 10 out of 10 because it delivers a strong balance between depth of capability and ease of use, particularly within organizations already operating in the Microsoft security ecosystem.

Incentivized

Overall it is good, it took a little while to understand it and figure things out but once you have a good grasp on it then, it is very good.

Incentivized

Support is usually really great at walking you through any steps you need to take when you get stuck on something. There are a few false positives and errors that have come up over the years that required their help to get through. Unfortunately, the steps required to diagnose some problems are more tedious than I think should be necessary. (IE: SQL instances can throw errors that clog up your logs because one plugin affects it in a certain way. The process to diagnose this is to watch timestamps of plugins in a log while monitoring the SQL logs at the same time and using your best guess as to what is causing it.)

Incentivized

Because Microsoft Defender External Attack Surface Management is part of the broader Microsoft Defender family (including Defender XDR, Entra ID, Azure Security, Sentinel, etc.), it:
Shares identity, endpoint, and threat context across tools
Reduces the need for custom integrations or connectors
Works in a “single pane of glass” experience for SOC analysts
Why it matters:
Organizations already invested in Microsoft security tools gain greater contextual insight and lower operational overhead.

Incentivized

Tenable.io has a comparable set of features, with excellent support and a competitive price. After less than desirable experiences with another company, we moved to Tenable and haven't looked back since.

Incentivized

• Reduced Business Risk from Unknown External Assets
• Operational Efficiency and Cost Avoidance
• Faster Risk Identification During Change Events

Incentivized

• Since this is a requirement for our PCI compliance and the cost is relatively low, the ROI isn't really something we need to think too much about, Tenable's pricing is fair and affordable.

Incentivized