Microsoft Defender EASM is a commercial external attack surface management solution by Microsoft. Siemba EASM is a commercial external attack surface management solution by Siemba. Features, integrations, deployment and the company behind each one, side by side.
What our shortlists say about the one we picked.
Best for: Microsoft shops adding external asset discovery
It belongs here if you already pay for Microsoft security, because discovered assets can move into Defender for Cloud and Copilot in Azure turns plain questions into inventory searches. It fits companies from small to enterprise. Its features center on discovery and flagging, so ask whether you also need active testing to prove which exposures are real.
From Best Attack Surface Management Solutions for Business, Fall 2026
Reviewed by Nika (Nikoloz) Kokhreidze.
Discovers and monitors external-facing assets and vulnerabilities
AI-driven EASM platform for discovering and monitoring external-facing assets
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Common questions when comparing Microsoft Defender EASM vs Siemba EASM for external attack surface management.
Microsoft Defender EASM: Discovers and monitors external-facing assets and vulnerabilities, built by Microsoft.
Siemba EASM: AI-driven EASM platform for discovering and monitoring external-facing assets, built by Siemba.
The table above shows where their features, integrations, deployment and company size fit differ.
Microsoft Defender EASM is made by Microsoft. Siemba EASM is made by Siemba. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.
Often, yes. Microsoft Defender EASM and Siemba EASM are both External Attack Surface Management products. Use the table above to see where features, deployment and company size fit differ.
Need the answer fast? Best Attack Surface Management Solutions for Business picks Palo Alto Networks Cortex Xpanse, Microsoft Defender EASM, Google Mandiant Attack Surface Management and 4 more.See the shortlist