Microsoft Sep 2025 Patch Tuesday: 81 fixes, two zero-days
🔒 Microsoft released its September 2025 Patch Tuesday addressing 81 vulnerabilities, including two publicly disclosed zero-days affecting Windows SMB Server and the Newtonsoft.Json library bundled with SQL Server. The update bundle contains nine Critical fixes — five remote code execution issues — and a total of 41 elevation-of-privilege vulnerabilities across Windows, Azure, and related components. Administrators are advised to apply patches promptly, enable and test SMB Server signing and Extended Protection for Authentication, enable auditing to check compatibility, and ensure SQL Server receives the patched Newtonsoft.Json to mitigate the disclosed flaws.
