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Vulnerability record · CVE-2009-3676 · published 13 November 2009

CVE-2009-3676: Microsoft windows 7 vulnerability

Microsoft · Windows 7

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."

7.1 CVSS 2.0 High EPSS 34% · top 1.6% CWE-399 · CWE-399
7.1CVSS 2.0 base score
34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
26References, 6 tagged exploit
16 Jun 2026Last modified by NVD

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."

AV:N/AC:M/Au:N/C:N/I:N/A:C

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-3676), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.