MC291008 – Take action: October 2021 security update available for all supported versions of Windows (archived)

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check before: 2021-10-12

Product:

Windows, Windows Server

Platform:

Web, Windows Desktop, World tenant

Status:

Change type:

Admin impact

Links:

Details:

The October 2021 security update release, referred to as our "B" release, is now available for Windows 11 and all supported versions of Windows 10. We recommend that you install these updates promptly. The Release Notes associated to this update contain a new video highlight with information on the contents in this release (Release notes might publish with a delay of up to an hour after the updates are available for download). To learn more about the different types of monthly quality updates, see our Windows quality updates primer.


REMINDER: Starting in October 2021, there will no longer be non-security releases (known as "C" releases) for Windows 10, version 1909. Only cumulative monthly security updates (known as the "B" or Update Tuesday release) will continue for Windows 10, version 1909.


Improvements and fixes for the Windows 11 update:


Addresses known compatibility issues between some Intel “Killer” and “SmartByte” networking software and Windows 11 (original release). Devices with the affected software might drop User Datagram Protocol (UDP) packets under certain conditions. This creates performance and other issues for protocols based on UDP. For example, some websites might load slower than others on the affected devices, which might cause videos to stream slower in certain resolutions. VPN solutions based on UDP might also be slower.


For instructions on how to install this update for your operating system, see the KB for your OS listed below:


Windows 11 (original release): KB5006674
Windows 10, version 21H1: KB5006670
Windows 10, version 20H2, Windows Server, version 20H2: KB5006670
Windows 10, version 20H1, Windows Server, version 20H1: KB5006670
Windows 10, version 1909, Windows Server, version 1909: KB5006667
Windows 10, version 1809, Windows Server, version 1809, Windows Server 2019: KB5006672
Windows 10, version 1607, Windows Server 2016: KB5006669
Windows 10, version 1507: KB5006675
Windows 8.1, Windows Server 2012 R2: Monthly Rollup KB5006714 / Security Only KB5006729
Windows Server 2012: Monthly Rollup KB5006739 / Security Only KB5006732
Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1: Monthly Rollup KB5006743 / Security Only KB5006728
Windows Server 2008 Service Pack 2: Monthly Rollup KB5006736 / Security Only KB5006715

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Created:
2022-02-11

updated:
2022-08-27

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change history

DatePropertyoldnew
2022-09-15MC prepareps://support.microsoft.com/help/5006667
ps://support.microsoft.com/help/5006669
ps://support.microsoft.com/help/500667
ps://support.microsoft.com/help/500667
ps://support.microsoft.com/help/5006674
ps://support.microsoft.com/help/5006675
ps://support.microsoft.com/help/5006714
ps://support.microsoft.com/help/5006715
ps://support.microsoft.com/help/5006728
ps://support.microsoft.com/help/5006729
ps://support.microsoft.com/help/500673
ps://support.microsoft.com/help/5006736
ps://support.microsoft.com/help/5006739
ps://support.microsoft.com/help/5006743
ps://techcommunity.microsoft.com/t5/windows-it-pro-blog/windows-quality-updates-primer/ba-p/2569385
https://support.microsoft.com/help/5006667
https://support.microsoft.com/help/5006669
https://support.microsoft.com/help/5006670
https://support.microsoft.com/help/5006672
https://support.microsoft.com/help/5006674
https://support.microsoft.com/help/5006675
https://support.microsoft.com/help/5006714
https://support.microsoft.com/help/5006715
https://support.microsoft.com/help/5006728
https://support.microsoft.com/help/5006729
https://support.microsoft.com/help/5006732
https://support.microsoft.com/help/5006736
https://support.microsoft.com/help/5006739
https://support.microsoft.com/help/5006743
https://techcommunity.microsoft.com/t5/windows-it-pro-blog/windows-quality-updates-primer/ba-p/2569385
2022-08-27MC preparehttps://support.microsoft.com/help/5006667
https://support.microsoft.com/help/5006669
https://support.microsoft.com/help/5006670
https://support.microsoft.com/help/5006672
https://support.microsoft.com/help/5006674
https://support.microsoft.com/help/5006675
https://support.microsoft.com/help/5006714
https://support.microsoft.com/help/5006715
https://support.microsoft.com/help/5006728
https://support.microsoft.com/help/5006729
https://support.microsoft.com/help/5006732
https://support.microsoft.com/help/5006736
https://support.microsoft.com/help/5006739
https://support.microsoft.com/help/5006743
https://techcommunity.microsoft.com/t5/windows-it-pro-blog/windows-quality-updates-primer/ba-p/2569385
ps://support.microsoft.com/help/5006667
ps://support.microsoft.com/help/5006669
ps://support.microsoft.com/help/500667
ps://support.microsoft.com/help/500667
ps://support.microsoft.com/help/5006674
ps://support.microsoft.com/help/5006675
ps://support.microsoft.com/help/5006714
ps://support.microsoft.com/help/5006715
ps://support.microsoft.com/help/5006728
ps://support.microsoft.com/help/5006729
ps://support.microsoft.com/help/500673
ps://support.microsoft.com/help/5006736
ps://support.microsoft.com/help/5006739
ps://support.microsoft.com/help/5006743
ps://techcommunity.microsoft.com/t5/windows-it-pro-blog/windows-quality-updates-primer/ba-p/2569385

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