Microsoft .NET Framework and Silverlight Remote Code Execution Vulnerability (2514842)

This host is missing a critical security update according to Microsoft Bulletin MS11-039.
Successful exploitation could allow attacker to execute arbitrary code within the context of the application. Impact Level: System/Application
Run Windows Update and update the listed hotfixes or download and update mentioned hotfixes in the advisory from the below link,
The flaw is due to an input validation error when passing values to trusted APIs. This can be exploited to access memory in an unsafe manner via a specially crafted XAML Browser Application or Silverlight application.
Microsoft Silverlight 4.0 Microsoft .NET Framework 4.0 Microsoft .NET Framework 3.5 Microsoft .NET Framework 3.5.1 Microsoft .NET Framework 3.5 Service Pack 1 Microsoft .NET Framework 2.0 Service Pack 2 Microsoft .NET Framework 2.0 Service Pack 1