Microsoft .NET Framework 1.0 SP3 1.1 SP1 2.0 SP2 3.0 SP2 3.5 SP1 3.5.1 and 4 does not properly handle an unspecified exception during use of partially trusted assemblies to serialize input data which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (aka XBAP) or (2) a crafted .NET Framework application aka \.NET Framework Serialization Vulnerability.\