CVE-2023-21819: Microsoft Windows 10 1809

High severity, CVSS 7.5. EPSS: 30.8% chance of exploitation in the next 30 days.

Windows Secure Channel Denial of Service Vulnerability

Affected products

• Microsoft Windows 10 1809: before 10.0.17763.4010 (fixed in 10.0.17763.4010)
• Microsoft Windows 10 20h2: before 10.0.19042.2604 (fixed in 10.0.19042.2604)
• Microsoft Windows 10 21h2: before 10.0.19044.2604 (fixed in 10.0.19044.2604)
• Microsoft Windows 10 22h2: before 10.0.19045.2604 (fixed in 10.0.19045.2604)
• Microsoft Windows 11 21h2: before 10.0.22000.1574 (fixed in 10.0.22000.1574)
• Microsoft Windows Server 2019: affected versions not specified
• Microsoft Windows Server 2022: affected versions not specified

Published 2023-02-14. Last modified 2026-08-19.