CVE-2021-42279: Microsoft Windows 10

Medium severity, CVSS 4.2. EPSS: 2.3% chance of exploitation in the next 30 days.

Chakra Scripting Engine Memory Corruption 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: affected versions not specified
• Microsoft Windows Server 2016: affected versions not specified; version 20h2 only; version 2004 only
• Microsoft Windows Server 2019: affected versions not specified
• Microsoft Windows Server 2022: affected versions not specified

Published 2021-11-10. Last modified 2026-08-19.