CVE-2023-28233: Microsoft Windows 11 21h2

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

Windows Secure Channel Denial of Service Vulnerability

Affected products

• Microsoft Windows 11 21h2: before 10.0.22000.1817 (fixed in 10.0.22000.1817)
• Microsoft Windows 11 22h2: before 10.0.22621.1555 (fixed in 10.0.22621.1555)
• Microsoft Windows Server 2022: affected versions not specified

Published 2023-04-11. Last modified 2026-06-17.