Microsoft .NET Framework 1.0 SP3 1.1 SP1 2.0 SP2 3.5 3.5.1 4 4.5 and 4.5.1 does not properly determine whether it is safe to execute a method which allows remote attackers to execute arbitrary code via (1) a crafted web site or (2) a crafted .NET Framework application that exposes a COM server endpoint aka \Type Traversal Vulnerability.\