.NET Framework August 2021 Security and Quality Rollup

Tara

Today, we are releasing the August 2021 Security and Quality Rollup Updates for .NET Framework.

Security

This release does not contain any new security fixes. See February 2021 Security and Quality Rollup for the latest security updates.

Quality and Reliability

This release contains the following quality and reliability improvements.

CLR1
  • In scenarios with both high numbers of assemblies and high numbers of GC heaps, Server GC can encounter serious lock contention during generation 2 GCs. A config switch has been introduced as a workaround. It can either be enabled from a .config file:
    <configuration>
      <runtime>
        <GCStaticsNoLock enabled="true"/>
      </runtime>
    </configuration>

    Or by setting environment variable COMPLUS_GCStaticsNoLockto a non-zero value. If the config switch is not enabled then behavior is unchanged compared to previous versions.

Windows Forms
  • Addresses an issue where some Windows Forms applications that use ToolStrip controls with ToolStripControlHost, and run under UIA Accessibility Tools, could make Accessibility Tools unresponsive.
  • Addresses a regression in the ComboBox item accessible object where Accessibility Tools was not able to distinguish between identical items in the ComboBox and was becoming unresponsive.

1 Common Language Runtime (CLR)

Getting the Update

The Security and Quality Rollup is available via Windows Update, Windows Server Update Services, and Microsoft Update Catalog.

Microsoft Update Catalog

You can get the update via the Microsoft Update Catalog. For Windows 10, NET Framework 4.8 updates are available via Windows Update, Windows Server Update Services, Microsoft Update Catalog. Updates for other versions of .NET Framework are part of the Windows 10 Monthly Cumulative Update.

**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, version 21H1
.NET Framework 3.5, 4.8 Catalog 5004331
Windows 10, version 20H2 and Windows Server, version 20H2
.NET Framework 3.5, 4.8 Catalog 5004331
Windows 10 2004 and Windows Server, version 2004
.NET Framework 3.5, 4.8 Catalog 5004331
Windows 10 1909
.NET Framework 3.5, 4.8 Catalog 5004333
Windows 10 1809 (October 2018 Update) and Windows Server 2019 5004870
.NET Framework 3.5, 4.7.2 Catalog 5004335
.NET Framework 3.5, 4.8 Catalog 5004332
Windows 10 1607 (Anniversary Update) and Windows Server 2016
.NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2 Catalog 5005043
.NET Framework 4.8 Catalog 5004752

The following table is for earlier Windows and Windows Server versions.

Product Version Security and Quality Rollup
Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 5004873
.NET Framework 3.5 Catalog 4578953
.NET Framework 4.5.2 Catalog 4578956
.NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 Catalog 5004759
.NET Framework 4.8 Catalog 5004754
Windows Server 2012 5004872
.NET Framework 3.5 Catalog 4578950
.NET Framework 4.5.2 Catalog 4578954
.NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 Catalog 5004758
.NET Framework 4.8 Catalog 5004753
Windows 7 SP1 and Windows Server 2008 R2 SP1 5004871
.NET Framework 3.5.1 Catalog 4578952
.NET Framework 4.5.2 Catalog 4578955
.NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 Catalog 5004757
.NET Framework 4.8 Catalog 5004755
Windows Server 2008 5004874
.NET Framework 2.0, 3.0 Catalog 4578951
.NET Framework 4.5.2 Catalog 4578955
.NET Framework 4.6 Catalog 5004757

 

Previous Monthly Rollups

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

1 comment

Leave a comment

  • Samarth Joshi

    Right at the beginning, “The June Security and Quality Rollup Update does not contain any new security fixes.”
    You mean August, right? It’s the same for the July blog post as well.