Microsoft October 2025 Security Updates

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The Microsoft October 2025 security updates have been released and consist of 177 new CVEs to Microsoft products.

Of the Microsoft CVEs released, 16 are rated Critical, 1 moderate and the rest are rated Important in severity. At the time of release, three are listed as being publicly known and three 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, .NET and Visual Studio, Github, Exchange Server, BitLocker, and Xbox.

Information regarding known issues with KBs included in the security updates can be found at the bottom of the page at October 2025 Security Updates - Release Notes - Security Update Guide - Microsoft.

Recommended Reading: See Dustin Childs review and analysis in Zero Day Initiative -- The October 2025 Security Update Review.

Important Note: Today, Windows 10 reaches end of support. See Windows 10 Extended Security Updates (ESU) for detailed information on the ESU program for personal devices.