The Microsoft September 2025 security updates have been released and consist of 80 new CVEs to Microsoft products. With the additional 5 non-Microsoft CVEs being documented, it brings the combined total to 85 CVEs.
Of the Microsoft CVEs released, 8 are rated Critical and the rest are rated Important in severity. At the time of release, one is listed as being publicly known and none are listed as under active attack.
The security updates apply to the following products, features and roles: Windows and Windows Components, Office and Office Components, Microsoft Edge (Chromium-based), Azure, Hyper-V, SQL Server, Defender Firewall Service, and Xbox.
Information regarding known issues with KBs included in the security updates can be found at the bottom of the page at September 2025 Security Updates - Release Notes - Security Update Guide - Microsoft.
Recommended Reading: See Dustin Childs review and analysis in Zero Day Initiative -- The September 2025 Security Update Review.
Additional Update Notes:
- Windows 10 End of Support -- On October 14, 2025, Windows 10 will reach end of support. See the Windows 10 blog for How to prepare for Windows 10 end of support by moving to Windows 11 today.
- Windows 10 Extended Security Updates (ESU) -- With Windows 10 scheduled to reach end of support on October 14, 2025, you can enroll your PC in Windows 10 Extended Security Updates and continue receiving security updates for one year. There are a number of articles about the process, with a simplified version at Major Geeks.
- MSRT -- The Malicious Software Removal Tool is now run on a quarterly basis rather than monthly. See Remove specific prevalent malware with Windows Malicious Software Removal Tool.
- Servicing Stack Updates -- Microsoft now combines the latest servicing stack update (SSU) for your operating system with the Latest Cumulative Updates (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
- Windows updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows, in addition to non-security updates. The updates are also available via search for the KB number in the Microsoft Update Catalog.
- For information on lifecycle and support dates for Windows 10 and Windows 11 operating systems, please see Windows 10 Home and Pro and Windows 11 Home and Pro.
- Windows Update History: Windows10, Windows 11
References
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