MC680543 – Take action: October 2023 security update is now available Icon

check before: 2023-10-24




Windows Desktop, World tenant


Change type:

Admin impact



The October 2023 security update release is now available for Windows 11 and all supported versions of Windows 10. We recommend that you install these updates promptly. For more information about the contents of this update, see the release notes, which are easily accessible from the Windows 11 and Windows 10 update history pages. To learn more about the different types of monthly quality updates, see Windows monthly updates explained. To be informed about the latest updates and releases, follow us on X (formerly Twitter) @WindowsUpdate.

Highlights for the Windows 11 update:
This update addresses security issues for your Windows operating system.
To protect against CVE-2023-44487, you should install the latest Windows update. Based on your use case, you can also set the limit of the RST_STREAMS per minute using the new registry keys in this update.
This security update includes improvements that were a part of update KB5030310 (released September 26, 2023).

Short on time? Watch our short Windows 11 update release notes video for this month's tips.

IMPORTANT The October 2023 security update is the last security release for some editions of Windows 11, version 21H2. Windows 11, version 22H2 will continue to receive security and optional releases.

For instructions on how to install this update for your operating system, see the KB for your OS listed below:
Windows 11, version 22H2: KB5031354
Windows 11, version 21H2: KB5031358
Windows 10, version 22H2: KB5031356
Windows 10, version 21H2: KB5031356
Windows 10 Enterprise LTSC 2019 and Windows Server 2019: KB5031361
Windows 10 LTSB 2016 and Windows Server 2016: KB5031362
Windows 10 LTSB 2015: KB5031377
Windows Server 2022: KB5031364
Windows Server 2012 R2: Monthly Rollup: KB5031419 / Security Only: KB5031407
Windows Server 2012: Monthly Rollup: KB5031442 / Security Only: KB5031427
Windows Server 2008 R2 Service Pack 1: Monthly Rollup: KB5031408 / Security Only: KB5031441
Windows Server 2008 Service Pack 2: Monthly Rollup: KB5031416 / Security Only: KB5031411

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