CVE-2021-1663: Microsoft Windows 10

Medium severity, CVSS 5.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Windows Projected File System FS Filter Driver Information Disclosure Vulnerability

Affected products

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

Published 2021-01-12. Last modified 2026-06-17.