This host is missing an important security update according to Microsoft Bulletin MS13-040.
Successful exploitation could allow an attacker to bypass security mechanism and gain access to restricted endpoint functions. 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, http://technet.microsoft.com/en-us/security/bulletin/ms13-040
The flaws are due to - Improper validation of XML signatures by the CLR - Error within the WCF endpoint authentication mechanism when handling queries
Microsoft .NET Framework 4 Microsoft .NET Framework 4.5 Microsoft .NET Framework 3.5 Microsoft .NET Framework 3.5.1 Microsoft .NET Framework 2.0 Service Pack 2