CVE-2021-43240: Microsoft Windows 10

High severity, CVSS 7.8. EPSS: 0.6% chance of exploitation in the next 30 days.

NTFS Set Short Name Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 10: version 20h2 only; version 21h1 only; version 21h2 only; version 1909 only; version 2004 only
• Microsoft Windows 11: affected versions not specified
• Microsoft Windows Server: version 20h2 only; version 2022 only
• Microsoft Windows Server 2016: version 2004 only

Published 2021-12-15. Last modified 2026-06-17.