Download Security Update for Microsoft .NET Framework 4.5 and .NET Framework 4.5.1 on Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1, Windows Vista Service Pack 2, and Windows Server 2008 Service Pack 2 from Official Microsoft Download Center

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Security Update for Microsoft .NET Framework 4.5 and .NET Framework 4.5.1 on Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1, Windows Vista Service Pack 2, and Windows Server 2008 Service Pack 2

A security issue has been identified that could allow an unauthenticated remote attacker to compromise your system and gain control over it.