Download Security Update for Microsoft .NET Framework 4.5.1 on Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 from Official Microsoft Download Center

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Security Update for Microsoft .NET Framework 4.5.1 on Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2

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