March 11, 2025—Hotpatch KB5053638 (OS Build 20348.3270)

Improvements and fixes

This security update includes quality improvements. The following summary outlines key issues addressed by the KB update after you install it. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.

• This update makes miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release.

If you installed earlier updates, your device downloads and installs only the new updates contained in this package.

How to get this update 

Before you install this update 

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the hotpatch update. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you are using Windows Update or Windows Server Update Services (WSUS), the latest SSU will be installed with this update.

Install this update

To install this update, use one of the following Windows and Microsoft release channels.

File information

For a list of the files that are in this update, download the file information for cumulative update 5053638.

For a list of the files that are in the servicing stack update, download the file information for the SSU (KB5053666) - version 20348.3320.