Download Microsoft .NET Framework 3.5.1 Security Update for Windows 7 and Windows Server 2008 R2 from Official Microsoft Download Center

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Microsoft .NET Framework 3.5.1 Security Update for Windows 7 and Windows Server 2008 R2

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A security issue has been identified that could allow an attacker to tamper with digitally signed content without being detected, when this content is being consumed by an application that makes uses of the Microsoft .NET Framework on a Windows-based system.