MC484710 – December 2022 security update available for all supported versions of Windows Icon

check before: 2022-12-28




Mac, Windows Desktop, World tenant


Change type:

Admin impact



The December 2022 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. 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. For instructions on how to install this update on your home device, check the Update Windows article. To learn more about the different types of monthly quality updates, see our Windows quality updates primer.

Note: The December 2022 security updates release notes for Windows Server 2022 and Windows Server 2019 have an important known issue documented: System Center Virtual Machine Manager might have issues using new NICs with VMs. More information is also available on Windows release health.

IMPORTANT: There will be no preview, non-security “C” releases for Windows 10 or Windows 11 this month. The "C" releases normally target the third week of the month.

Highlights for the Windows 11 update:
Addresses a known issue that might affect Task Manager, which might display certain elements in unexpected colors if you have "Choose your mode" set to "Custom" in the Colors section of Settings.
Includes quality improvements to the servicing stack, which is the component that installs Windows updates.

Short on time? Watch our short monthly release notes video for a summary of this month’s Windows 11 update.

For instructions on how to install this update for your operating system, see the KB for your OS listed below:
Windows 11, version 22H2: KB5021255
Windows 11, version 21H2: KB5021234
Windows 10, version 22H2: KB5021233
Windows 10, version 21H2: KB5021233
Windows 10, version 21H1: KB5021233
Windows 10 Enterprise LTSC 2019 and Windows Server 2019: KB5021237
Windows 10 LTSB 2016 and Windows Server 2016: KB5021235
Windows 10 LTSB 2015: KB5021243
Windows 8.1, Windows Server 2012 R2: Monthly Rollup: KB5021294 / Security Only: KB5021296
Windows Server 2022: KB5021249
Windows Server 2012: Monthly Rollup: KB5021285 / Security Only: KB5021303
Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1: Monthly Rollup: KB5021291 / Security Only: KB5021288
Windows Server 2008 Service Pack 2: Monthly Rollup: KB5021289 / Security Only: KB5021289

Change Category:


Release Phase:



the free basic plan is required to see all details. Sign up here

A plan is required to see all the changed details. If you are already a customer, choose login.
If you are new to please choose a plan.

Share to MS Teams

Login to your account

Welcome Back, We Missed You!