.NET Framework June 2021 Security and Quality Rollup Updates

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

Security

The June Security and Quality Rollup Update 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
  • Addresses a performance issue caused by incorrect configuration in the GC.
  • Addresses an issue where a background GC could pause the runtime for a long period of time if a large managed heap is filled with long lived objects with a deep chain of references.
  • Addresses an issue where crashes could occur if security stackwalks were generated during ThreadAbortException handling.
NCL2
  • .NET Framework 4.8 will now allow to negotiate TLS 1.3 if underlying OS supports it.
WPF3
  • Addresses an issue when rapid typing using an IME can crash via FailFast.
  • Addresses an issue where Thaana characters displayed in left-to-right order.
  • Addresses a crash when WebBrowser receives a completion event for a navigation it tried to cancel.


1 Common Language Runtime (CLR)
2 Network Class Library (NCL)
3 Windows Presentation Foundation (WPF)

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.

**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 5003254
Windows 10, version 20H2 and Windows Server, version 20H2
.NET Framework 3.5, 4.8 Catalog 5003254
Windows 10 version 2004 and Windows Server, version 2004
.NET Framework 3.5, 4.8 Catalog 5003254
Windows 10 version 1909
.NET Framework 3.5, 4.8 Catalog 5003256
Windows 10 version 1809 (October 2018 Update) and Windows Server 2019 5003778
.NET Framework 3.5, 4.7.2 Catalog 5003258
.NET Framework 3.5, 4.8 Catalog 5003255
Windows 10 version 1607 (Anniversary Update) and Windows Server 2016
.NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2 Catalog 5003638
.NET Framework 4.8 Catalog 5003542

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 5003781
.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 5003549
.NET Framework 4.8 Catalog 5003545
Windows Server 2012 5003780
.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 5003548
.NET Framework 4.8 Catalog 5003544
Windows 7 SP1 and Windows Server 2008 R2 SP1 5003779
.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 5003547
.NET Framework 4.8 Catalog 5003543
Windows Server 2008 5003782
.NET Framework 2.0, 3.0 Catalog 4578951
.NET Framework 4.5.2 Catalog 4578955
.NET Framework 4.6 Catalog 5003547

 

Previous Monthly Rollups

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

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