Microsoft .NET Framework 2.0 SP2 3.5.1 and 4 and Silverlight 4 before 4.1.10111 does not properly restrict access to memory associated with unmanaged objects 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 Unmanaged Objects Vulnerability.\