CVE-2021-40465: Microsoft Windows 10

High severity, CVSS 7.8. EPSS: 2.5% chance of exploitation in the next 30 days.

Windows Text Shaping Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 10: affected versions not specified; version 20h2 only; version 21h1 only; version 1607 only; version 1809 only; version 1909 only; …
• Microsoft Windows 11 21h2: any version
• Microsoft Windows 7: version sp1 only
• Microsoft Windows 8.1: affected versions not specified
• Microsoft Windows Rt 8.1: affected versions not specified
• Microsoft Windows Server: version 20h2 only
• Microsoft Windows Server 2008: version r2 only; version sp2 only
• Microsoft Windows Server 2012: affected versions not specified; version r2 only
• Microsoft Windows Server 2016: affected versions not specified; version 2004 only
• Microsoft Windows Server 2019: affected versions not specified
• Microsoft Windows Server 2022: any version

Published 2021-10-13. Last modified 2026-06-17.