Microsoft: Multiple .NET Framework versions reach end of life in April

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Microsoft has reminded customers that multiple .NET Framework versions signed using the insecure Secure Hash Algorithm 1 (SHA-1) will reach their end of life this month.

The .NET Framework is a free software development framework designed to assist developers in building .NET applications, websites, and services, and users run them on many operating systems (including Windows) with the help of different implementations of .NET.

"On April 26, 2022, the .NET Framework 4.5.2, 4.6, and 4.6.1 will reach end of support, and after this date, Microsoft will no longer provide updates including security fixes and technical support for these versions," Microsoft said in a Windows message center update.
"There is no change to the support timelines for any other .NET Framework version. If you are using .NET Framework 4.5.2, 4.6, or 4.6.1, you will need to upgrade to a later version to stay supported."

As already revealed as part of the initial announcement, there is an exception to this, however: the .NET Framework 4.6 version shipping with Windows 10 Enterprise LTSC 2015 will still be supported until October 2025, when the OS will reach its end of life.

Microsoft advises .NET developers to migrate their apps to at least .NET Framework 4.6.2 or later before April 26, 2022, to keep receiving technical support and security updates.

.NET Framework 4.6.2 (shipped almost five years ago) and .NET Framework 4.8 (shipped eight years ago) are both compatible in-place replacements and stable runtimes already "broadly deployed to hundreds of millions of computers via Windows Update (WU)."
 

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