High7.5Microsoft Server

High [CVE-2023-21819] Windows Secure Channel Denial of Service Vulnerability

This high-severity Microsoft Server advisory covers CVE-2023-21819 affecting Windows Server 2019 (Server Core installation), Windows Server 2022.

CVE-2023-21819 Published Feb 14, 2023Updated by vendor Aug 19, 2026

CVE-2023-21819

Affected products & platforms

Microsoft ServerWindows Server

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Summary

Windows Secure Channel Denial of Service Vulnerability

Affected products named by the advisory: Windows Server 2019; Windows Server 2019 (Server Core installation); Windows Server 2022.

Affected versions

Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.4010
Windows 10 Version 1809 10.0.0 before 10.0.17763.4010
Windows 10 Version 20H2 10.0.0 before 10.0.19042.2604
Windows 10 Version 21H2 10.0.19043.0 before 10.0.19044.2604
Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.2604
Windows 11 version 21H2 10.0.0 before 10.0.22621.1574
Windows Server 2019 10.0.17763.0 before 10.0.17763.4010
Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.4010
Windows Server 2022 10.0.20348.0 before 10.0.20348.1547

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions

10.0.17763.4010
10.0.19042.2604
10.0.19044.2604
10.0.19045.2604
10.0.22621.1574
10.0.20348.1547

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation

Upgrade to a fixed release: 10.0.17763.4010, 10.0.19042.2604, 10.0.19044.2604, 10.0.19045.2604, 10.0.22621.1574, 10.0.20348.1547. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Discussion(0)

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