What’s Vulnerable › Vulnerabilities

CVE-2011-0661

• Severity: critical (CVSS 10.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 44.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-04-13 · updated 2026-06-16
• Weakness: CWE-20

Description

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: all versions
• Microsoft Windows 7: all versions
• Microsoft Windows Server 2003: all versions
• Microsoft Windows Server 2008: r2
• Microsoft Windows Vista: all versions
• Microsoft Windows XP Service Pack 3: all versions

References

• http://osvdb.org/71781
• http://secunia.com/advisories/44072
• http://www.securityfocus.com/bid/47198
• http://www.securitytracker.com/id?1025329
• http://www.us-cert.gov/cas/techalerts/TA11-102A.html
• http://www.vupen.com/english/advisories/2011/0939
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-020
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12076
• http://osvdb.org/71781
• http://secunia.com/advisories/44072
• http://www.securityfocus.com/bid/47198
• http://www.securitytracker.com/id?1025329

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