Download Security Update for Microsoft .NET Framework 3.5.1 on 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 3.5.1 on Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1

A security issue has been identified that could allow an unauthenticated remote attacker to cause the affected system to stop responding.