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Microsoft Releases Patch for .NET Framework Issue After 3-Year Investigation

Strategic Insights

— 2 min read

Microsoft has finally released a patch to resolve the .NET Framework issue that was causing apps to throw exceptions, fail, or close, particularly in Windows Server installations. The problem, which was first reported in February 2022, affected various versions of Windows Server, including Windows Server 2012 and later. The out-of-band update, which is not available through Windows Update, can be downloaded from the Microsoft Update Catalog and then imported into Windows Server Update Services (WSUS) and Microsoft Endpoint Configuration Manager. The patch resolves the issue for .NET Framework versions 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, and 4.8.

Key Takeaways:

  • The .NET Framework issue, which caused apps to throw exceptions, fail, or close, was first reported in February 2022 and remained unresolved for over three years.
  • The out-of-band patch, which is not available through Windows Update, can be downloaded from the Microsoft Update Catalog and then imported into WSUS and Microsoft Endpoint Configuration Manager.
  • The patch resolves the issue for various versions of Windows Server, including Windows Server 2012 and later.
  • The patch covers .NET Framework versions 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, and 4.8.
  • Windows 2025 and client versions of Windows are not affected by this issue.
  • The patch is available for download from the following links:

+ Windows Server 2022 .NET Framework 4.8 KB5011258

+ Windows Server 2019 .NET Framework 4.8 KB5011257

+ .NET Framework 4.7.2 KB5011259

+ .NET Framework 4.6.2, 4.7, 4.7.1 or 4.7.2 KB5011329

+ .NET Framework 4.8 KB5011264

+ .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1 or 4.7.2 KB5011263

+ .NET Framework 4.5.2 KB5011261

+ .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1 or 4.7.2 KB5011262

+ .NET Framework 4.5.2 KB5011260

Statistics:

  • 3 years: The duration of the investigation period for the .NET Framework issue.
  • 8: The number of .NET Framework versions affected by the issue.
  • 4: The number of Windows Server versions affected by the issue.
  • 2022: The year the issue was first reported.

Sources:

  • Microsoft Windows Release Health dashboard (no date provided)
  • Microsoft Update Catalog (no date provided)
  • Windows Server 2022 .NET Framework 4.8 KB5011258 (no date provided)
  • Windows Server 2019 .NET Framework 4.8 KB5011257 (no date provided)
  • .NET Framework 4.7.2 KB5011259 (no date provided)
  • .NET Framework 4.6.2, 4.7, 4.7.1 or 4.7.2 KB5011329 (no date provided)
  • .NET Framework 4.8 KB5011264 (no date provided)
  • .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1 or 4.7.2 KB5011263 (no date provided)
  • .NET Framework 4.5.2 KB5011261 (no date provided)
  • .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1 or 4.7.2 KB5011262 (no date provided)
  • .NET Framework 4.5.2 KB5011260 (no date provided)

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