Yesterday, we released the October 2021 Security and Quality Rollup for .NET Framework.
Security
The October Security and Quality Rollup 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.
The existing memory pressure algorithm used in the GC.AddMemoryPressure API is triggering induced GC too aggressively. This update provides an alternative algorithm that is less aggressive. An application can opt into the new algorithm, by setting:COMPlus_GCNewMemoryPressure environment variable to 1This is applicable for any application that use the GC.AddMemoryPressure API.
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 and newer versions.
Product Version
Cumulative Update
Windows 11
.NET Framework 3.5, 4.8
Catalog
5005537
Microsoft server operating systems version 21H2
.NET Framework 3.5, 4.8
Catalog
5005538
Windows 10 21H1
.NET Framework 3.5, 4.8
Catalog
5005539
Windows 10, version 20H2 and Windows Server, version 20H2
.NET Framework 3.5, 4.8
Catalog
5005539
Windows 10 2004 and Windows Server, version 2004
.NET Framework 3.5, 4.8
Catalog
5005539
Windows 10 1909
.NET Framework 3.5, 4.8
Catalog
5005541
Windows 10 1809 (October 2018 Update) and Windows Server 2019
5006765
.NET Framework 3.5, 4.7.2
Catalog
5005543
.NET Framework 3.5, 4.8
Catalog
5005540
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
5006669
.NET Framework 4.8
Catalog
5006065
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
5006763
.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
5006064
.NET Framework 4.8
Catalog
5006067
Windows Server 2012
5006762
.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
5006063
.NET Framework 4.8
Catalog
5006066
Windows 7 SP1 and Windows Server 2008 R2 SP1
5006761
.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
5006061
.NET Framework 4.8
Catalog
5006060
Windows Server 2008
5006764
.NET Framework 2.0, 3.0
Catalog
4578951
.NET Framework 4.5.2
Catalog
4578955
.NET Framework 4.6
Catalog
5006061
Previous Monthly Rollups
The last few .NET Framework Monthly updates are listed below for your convenience:
.NET Framework August 2021 Security and Quality Rollup
.NET Framework July 2021 Cumulative Update Preview
.NET Framework July 2021 Security and Quality Rollup
.NET Framework June 2021 Cumulative Update Preview
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