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

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

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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.