High7.8Microsoft Server Exploited CISA KEV

High [CVE-2021-36948] Windows Update Medic Service Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2021-36948 affecting Windows Server 2019 (Server Core installation), Windows Server version 2004, Windows Server version 20H2.

CVE-2021-36948 Published Aug 12, 2021Updated by vendor Aug 10, 2026

CVE-2021-36948

Affected products & platforms

Microsoft ServerWindows Server

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Summary

Windows Update Medic Service Elevation of Privilege Vulnerability

Affected products named by the advisory: Windows Server 2019; Windows Server 2019 (Server Core installation); Windows Server version 2004; Windows Server version 20H2.

CISA Known Exploited Vulnerability

Listed:: Nov 3, 2021 · federal remediation due Nov 17, 2021
Required action:: Apply updates per vendor instructions.
Ransomware use:: Unknown

KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.

Affected versions

Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.2114
Windows 10 Version 1809 10.0.0 before 10.0.17763.2114
Windows 10 Version 1909 10.0.0 before 10.0.18363.1734
Windows 10 Version 2004 10.0.0 before 10.0.19041.1165
Windows 10 Version 20H2 10.0.0 before 10.0.19042.1165
Windows 10 Version 21H1 10.0.0 before 10.0.19043.1165
Windows Server 2019 10.0.17763.0 before 10.0.17763.2114
Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.2114
Windows Server version 2004 10.0.0 before 10.0.19041.1165
Windows Server version 20H2 10.0.0 before 10.0.19042.1165

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

Fixed versions

10.0.17763.2114
10.0.18363.1734
10.0.19041.1165
10.0.19042.1165
10.0.19043.1165

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

Mitigation checklist

Recommended fix / mitigation

Windows Update Medic Service Elevation of Privilege Vulnerability

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

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