CVE-2011-0661: Microsoft Windows 2003 Server

High severity, CVSS 10.0. EPSS: 44.6% chance of exploitation in the next 30 days.

The SMB Server service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate fields in SMB requests, which allows remote attackers to execute arbitrary code via a malformed request in a (1) SMBv1 or (2) SMBv2 packet, aka "SMB Transaction Parsing Vulnerability."

Affected products

• Microsoft Windows 2003 Server: any version
• Microsoft Windows 7: affected versions not specified
• Microsoft Windows Server 2003: any version
• Microsoft Windows Server 2008: any version; affected versions not specified; version r2 only
• Microsoft Windows Vista: any version
• Microsoft Windows XP: any version; affected versions not specified

Published 2011-04-13. Last modified 2026-06-16.