Microsoft .NET Framework 2.0 SP1 and SP2 3.5 Gold and SP1 3.5.1 and 4.0 and Silverlight 4 before 4.0.60531.0 does not properly validate arguments to unspecified networking API functions 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 Array Offset Vulnerability.\