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CVE-2011-1253

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 13.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-10-12 · updated 2026-06-16
• Weakness: CWE-264

Description

Microsoft .NET Framework 1.0 SP3, 1.1 SP1, 2.0 SP2, 3.5.1, and 4, and Silverlight 4 before 4.0.60831, does not properly restrict inheritance, which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (aka XBAP), (2) a crafted ASP.NET application, (3) a crafted .NET Framework application, or (4) a crafted Silverlight application, aka ".NET Framework Class Inheritance Vulnerability."

Affected products

• Microsoft .NET Framework: 1.0-sp3, 1.1-sp1, 2.0-sp2, 3.5.1, 4.0
• Microsoft Silverlight: 4.0.60531.0

References

• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-078
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13069
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-078
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13069

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