CVE-2009-2497: Microsoft .NET Framework

High severity, CVSS 9.3. EPSS: 23.3% chance of exploitation in the next 30 days.

The Common Language Runtime (CLR) in Microsoft .NET Framework 2.0, 2.0 SP1, 2.0 SP2, 3.5, and 3.5 SP1, and Silverlight 2, does not properly handle interfaces, which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (XBAP), (2) a crafted Silverlight application, (3) a crafted ASP.NET application, or (4) a crafted .NET Framework application, aka "Microsoft Silverlight and Microsoft .NET Framework CLR Vulnerability."

Affected products

• Microsoft .NET Framework: version 2.0 only; version 1.1 only; version 3.5 only; version 1.0 only
• Microsoft Windows 2000: 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
• Microsoft Windows Vista: any version
• Microsoft Windows XP: any version; affected versions not specified

Published 2009-10-14. Last modified 2026-06-16.