CVE-2023-21757: Microsoft Windows 10

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

Windows Layer 2 Tunneling Protocol (L2TP) Denial of Service Vulnerability

Affected products

• Microsoft Windows 10: affected versions not specified; version 20h2 only; version 21h2 only; version 22h2 only; version 1607 only; version 1809 only
• Microsoft Windows 11: affected versions not specified; version 21h2 only; version 22h2 only
• Microsoft Windows 7: affected versions not specified
• Microsoft Windows 8.1: affected versions not specified
• Microsoft Windows Rt 8.1: affected versions not specified
• Microsoft Windows Server 2008: affected versions not specified; version r2 only
• Microsoft Windows Server 2012: affected versions not specified; version r2 only
• Microsoft Windows Server 2016: affected versions not specified
• Microsoft Windows Server 2019: affected versions not specified
• Microsoft Windows Server 2022: affected versions not specified

Published 2023-01-10. Last modified 2026-06-17.