Microsoft Windows Security Updates for October 2025 are now available

Welcome to the "end of support for Windows 10" edition of our monthly overview of Microsoft security updates for Windows. Microsoft has released the last official security update for Windows 10 and also updates for Windows 11 and other company products, including Microsoft Office.

If you do run Windows 10, you may want to check out the options that you have. In short, best option for most users is probably to subscribe to ESU to get another year of support.

Microsoft Windows Security Updates: October 2025

You may download the following Excel spreadsheet to get a list of released updates. Click on the following link to download the archive to the local device: Windows October 2025 security updates

Executive Summary

• Microsoft released a total of 175 security updates for various Microsoft products and 21 security update for non-Microsoft issues (e.g. Chromium).
• Windows clients with issues:
  • Windows 10: none
  • Windows 11: 24H2 and 25H2
• Windows Server clients with issues:
  • Windows Server 2008

Product overview

Each supported version of Windows and their critical vulnerabilities are listed below.

• Windows 10 version 22H2: 97 vulnerabilities, 2 critical, 95 important
  • MITRE CVE-2016-9535: LibTIFF Heap Buffer Overflow Vulnerability -- CVE-2016-9535
  • Plus Microsoft Graphics Component Elevation of Privilege Vulnerability -- CVE-2025-49708
• Windows 11 version 23H2: 107 vulnerabilities, 2 critical, 105 important
  • Same as Windows 10 version 22H2.
• Windows 11 version 24H2: 124 vulnerabilities, 2 critical, 121 important, and 1 moderate
  • Same as Windows 10 version 22H2.
• Windows 11 version 25H2: 116 vulnerabilities, 2 critical, 114 important
  • Same as Windows 10 version 22H2.

Windows Server products

• Windows Server 2008 R2 (extended support only): 37 vulnerabilities: 1 critical,  36 important
  • MITRE CVE-2016-9535: LibTIFF Heap Buffer Overflow Vulnerability -- CVE-2016-9535
• Windows Server 2016: 73 vulnerabilities: 2 critical, 71 important
  • MITRE CVE-2016-9535: LibTIFF Heap Buffer Overflow Vulnerability -- CVE-2016-9535
  • Windows Server Update Service (WSUS) Remote Code Execution Vulnerability -- CVE-2025-59287
• Windows Server 2019: 95 vulnerabilities: 3 critical, 92 important
  • Same as Windows Server 2016.
  • Plus Microsoft Graphics Component Elevation of Privilege Vulnerability -- CVE-2025-49708
• Windows Server 2022: 103 vulnerabilities: 3 critical, 99 important, and 1 moderate
  • Same as Windows Server 2019.
• Windows Server 2025:  130 vulnerabilities: 3 critical, 126 important, and 1 moderate
  • Same as Windows Server 2019.

Windows Security Updates

Windows 10 version 22H2

• Support Page: KB5066791

Updates and improvements:

• Fixed an SMB v1 connection issue that might prevent connecting to shared files or folders.
• Fixed a Windows Autopilot issue that could prevent the OOBE from loading.
• Removes the ltmdm64.sys driver. Fax modem hardware that depends on the driver won't work anymore.
• Fixed a Powershell Remoting and WinRM issue that saw commands time out after 600 seconds.

Windows 11 version 23H2

• Support Page: KB5066793

Updates and improvements:

• Fixed an issue with PowerShell Remoting and WinRM that had commands time out after 10 minutes.
• A few non-critical fixes. See this overview.

Windows 11 version 24H2

• Support page: KB5066835

Updates and improvements:

• Removes the ltmdm64.sys driver. Fax modem hardware that depends on the driver won't work anymore.
• Fixed an issue with PowerShell Remoting and WinRM that had commands time out after 10 minutes.
• Fixed an issue that caused the print preview screen to stop responding in Chromium-based browsers.
• Adds the new command line text editor Edit, which you can run by launching Edit from the Terminal app.
• Gradual rollout of various new features continues. Some limited to Copilot+ PCs.
• Includes several non-security fixes for various issues.
• The WSUS issue is fixed.
• You can check the full preview list here.

Windows 11 version 25H2

• Support page: KB5066835

Updates and improvements:

• Same as Windows 11, version 24H2
• You can check out the full list here.

Known Issues

Windows 11 version 24H2 and 25H2

• Problems playing protected content using some Blu-Ray, DVD, or Digital TV apps. Some content may not play in certain apps, playback may be interrupted, copyright messages may show, playback may stop, or show black screens.
  • Partially resolved according to Microsoft, stating that it has been addressed in the September 2025 preview update (and also this update)

Security advisories and updates

• ADV 990001 -- Latest Servicing Stack Updates

Microsoft Office Updates

How to download and install the October 2025 security updates