.NET Framework August 2020 Cumulative Update Preview

Tara Overfield

Today, we are releasing the August 2020 Cumulative Update Preview Updates for .NET Framework.

Quality and Reliability

This release contains the following quality and reliability improvements.

  • Addresses an issue with a crash on COM interop to properly return the hresult for the Out of Memory Exception
  • Addresses an issue in some 32 bit apps where, in certain scenarios, the JIT might omit a function call
  • Improved support for cleaning up private temporary certificate keys
  • Improved spell checking so words like “etc.” and “e.g.” will no longer be identified as spelling errors when spell-checking is enabled in WPF TextBox or RichTextBox
  • Addresses an issue with a null-reference crash in automation code, arising from re-entrancy when reconnection to a remote desktop

1 Common Language Runtime (CLR)

2 Windows Presentation Foundation (WPF)

Getting the Update

The Cumulative Update Preview is available via Windows Update, Windows Server Update Services, and Microsoft Update Catalog.

Microsoft Update Catalog

You can get the update via the Windows Update or Microsoft Update Catalog.

**Note**: Customers that rely on Windows Update and Windows Server Update Services will automatically receive the .NET Framework version-specific updates. Advanced system administrators can also take use of the below direct Microsoft Update Catalog download links to .NET Framework-specific updates. Before applying these updates, please ensure that you carefully review the .NET Framework version applicability, to ensure that you only install updates on systems where they apply.

The following table is for Windows 10 and Windows Server 2016+ versions.

Product Version Cumulative Update
Windows 10 1909 and Windows Server, version 1909
.NET Framework 3.5, 4.8 Catalog 4570723
Windows 10 1903 and Windows Server, version 1903
.NET Framework 3.5, 4.8 Catalog 4570723
Windows 10 1809 (October 2018 Update) and Windows Server 2019 4571462
.NET Framework 3.5, 4.7.2 Catalog 4570720
.NET Framework 3.5, 4.8 Catalog 4570722


Previous Monthly Rollups

The last few .NET Framework Monthly updates are listed below for your convenience:


Discussion is closed. Login to edit/delete existing comments.

  • Dean Jackson 0

    I don’t like .Net preview updates being listed in Windows Updates for Windows 10 as normal “required” updates, and that will download automatically.

    Aren’t “preview” updates to .Net supposed to be optional? When the preview is shown along with other updates like Windows Defender, when we click the “Download” button, will the preview update also be downloaded? If so, how can we use the download button, but NOT get the preview update??

    • Chris J. Olesch 0

      I have a similar issue where the preview patches for .NET are forced download/installed on production servers that aren’t in the insider builds. Once installed I cannot uninstall them.

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