What’s Vulnerable › Vulnerabilities

CVE-2011-3416

• Severity: high (CVSS 8.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 43.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-12-30 · updated 2026-06-16
• Weakness: CWE-264

Description

The Forms Authentication feature in the ASP.NET subsystem in Microsoft .NET Framework 1.1 SP1, 2.0 SP2, 3.5 SP1, 3.5.1, and 4.0 allows remote authenticated users to obtain access to arbitrary user accounts via a crafted username, aka "ASP.Net Forms Authentication Bypass Vulnerability."

Affected products

• 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: sp3-unknown

References

• http://www.us-cert.gov/cas/techalerts/TA11-347A.html
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-100
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14363
• http://www.us-cert.gov/cas/techalerts/TA11-347A.html
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-100
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14363

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