# Microsoft Defender EASM vs Siemba EASM: side-by-side comparison (2026)

[Microsoft Defender EASM](https://cybersectools.com/tools/microsoft-defender-external-attack-surface-management) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Microsoft](https://cybersectools.com/companies/microsoft). [Siemba EASM](https://cybersectools.com/tools/siemba-easm) is a commercial [external attack surface management](https://cybersectools.com/categories/external-asm) solution by [Siemba](https://cybersectools.com/companies/siemba). Features, integrations, deployment and the company behind each one, side by side.

## Our take

What our shortlists say about the one we picked.

### [Microsoft Defender EASM](https://cybersectools.com/tools/microsoft-defender-external-attack-surface-management)

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](https://cybersectools.com/shortlists/best-attack-surface-solutions), Fall 2026.

Reviewed by [Nika (Nikoloz) Kokhreidze](https://cybersectools.com/about).

Need the answer fast? [Best Attack Surface Management Solutions for Business](https://cybersectools.com/shortlists/best-attack-surface-solutions) picks Palo Alto Networks Cortex Xpanse, Microsoft Defender EASM, Google Mandiant Attack Surface Management and 4 more.

## Side-by-side comparison

| | Microsoft Defender EASM | Siemba EASM |
|---|---|---|
| Pricing model | Commercial | Commercial |
| Category | External Attack Surface Management | External Attack Surface Management |
| Verified | No | No |
| Deployment type | Cloud | Cloud |
| Company size fit | SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise |
| Company | Microsoft | Siemba |
| Headquarters | – | – |

### Use cases and capabilities

| | Microsoft Defender EASM | Siemba EASM |
|---|---|---|
| Misconfiguration | – | Yes |
| TLS | – | Yes |

### Core features

**Microsoft Defender EASM**

10 features listed. Sign in on the page to see them.

**Siemba EASM**

10 features listed. Sign in on the page to see them.

### Integrations

**Microsoft Defender EASM**

4 integrations listed. Sign in on the page to see them.

**Siemba EASM**

6 integrations listed. Sign in on the page to see them.

## Microsoft Defender EASM vs Siemba EASM FAQ

Common questions when comparing Microsoft Defender EASM vs Siemba EASM for external attack surface management.

### What is the difference between Microsoft Defender EASM and Siemba EASM?

**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.

### Who makes Microsoft Defender EASM and Siemba EASM?

**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.

### Is Microsoft Defender EASM a good alternative to Siemba EASM?

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.

## Related comparisons

- [Microsoft Defender EASM vs Strobes Attack Surface Management](https://cybersectools.com/compare/microsoft-defender-external-attack-surface-management-vs-strobes-attack-surface-management)
- [Microsoft Defender EASM vs Cyber Exposure Manager](https://cybersectools.com/compare/galileo-security-vs-microsoft-defender-external-attack-surface-management)
- [Microsoft Defender EASM vs CyberXTron ShadowSpot](https://cybersectools.com/compare/cyberxtron-shadowspot-vs-microsoft-defender-external-attack-surface-management)
- [Siemba EASM vs Strobes Attack Surface Management](https://cybersectools.com/compare/siemba-easm-vs-strobes-attack-surface-management)
- [Siemba EASM vs Cyber Exposure Manager](https://cybersectools.com/compare/galileo-security-vs-siemba-easm)
- [Siemba EASM vs CyberXTron ShadowSpot](https://cybersectools.com/compare/cyberxtron-shadowspot-vs-siemba-easm)

## Alternatives to each

- [See all Microsoft Defender EASM alternatives](https://cybersectools.com/alternatives/microsoft-defender-external-attack-surface-management)
- [See all Siemba EASM alternatives](https://cybersectools.com/alternatives/siemba-easm)

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Source: https://cybersectools.com/compare/microsoft-defender-external-attack-surface-management-vs-siemba-easm

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/microsoft-defender-external-attack-surface-management.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on Microsoft Defender EASM and Siemba EASM: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md