CVE-2021-42286: Microsoft Windows 10

High severity, CVSS 7.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10: version 20h2 only; version 21h1 only; version 2004 only
• Microsoft Windows Server: version 20h2 only
• Microsoft Windows Server 2016: version 2004 only

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