CVE-2021-27086: Microsoft Windows 10

High severity, CVSS 7.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Windows Services and Controller App Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10: version 20h2 only; version 1803 only; version 1809 only; version 1909 only; version 2004 only
• Microsoft Windows Server 2016: version 20h2 only; version 1909 only; version 2004 only
• Microsoft Windows Server 2019: affected versions not specified

Published 2021-04-13. Last modified 2026-06-17.