CVE-2011-1253: Microsoft .NET Framework

High severity, CVSS 9.3. EPSS: 13.2% chance of exploitation in the next 30 days.

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: version 1.0 only; version 1.1 only; version 2.0 only; version 3.5.1 only; version 4.0 only
• Microsoft Silverlight: version 4.0.60531.0 only

Published 2011-10-12. Last modified 2026-06-16.