Download Microsoft .NET Framework 3.5 Security Update for Windows Server 2003 and Windows XP from Official Microsoft Download Center

Microsoft .NET Framework 3.5 Security Update for Windows Server 2003 and Windows XP

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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.