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CVE-2021-36948

Microsoft Windows Update Medic Service Privilege Escalation Vulnerability

Microsoft WindowsOperating systems
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationExploited in the wildAdded to KEV 3 Nov 2021CISA KEV
Exploit odds (EPSS)23.3%Chance of exploitation activity in the next 30 days, higher than 97% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.17763.2114Also 10.0.18363.1734, 10.0.19041.1165 and 2 moreCVE List
Federal deadline17 Nov 2021Remediation due date for US federal agenciesCISA KEV
CISA required actionApply updates per vendor instructions. CISA KEV

What fixes it

  • 10.0.17763.2114Windows 10 Version 1809CVE List
  • 10.0.18363.1734Windows 10 Version 1909CVE List
  • 10.0.19041.1165Windows 10 Version 2004CVE List
  • 10.0.19042.1165Windows 10 Version 20H2CVE List
  • 10.0.19043.1165Windows 10 Version 21H1CVE List
  • 10.0.17763.2114Windows Server 2019CVE List
Show all 9 fixed versions
  • 10.0.17763.2114Windows Server 2019 (Server Core installation)CVE List
  • 10.0.19041.1165Windows Server version 2004CVE List
  • 10.0.19042.1165Windows Server version 20H2CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 12 Aug 2021, 18:12 UTCPublishedCVE List
  2. 3 Nov 2021Added to CISA KEVCISA KEV

Description

Microsoft Windows Update Medic Service contains an unspecified vulnerability that allows for privilege escalation.

Text from CVE List

Affected versions 10

  • Windows 10 Version 1809affected: 10.0.17763.0 before 10.0.17763.2114CVE List
  • Windows 10 Version 1809affected: 10.0.0 before 10.0.17763.2114CVE List
  • Windows 10 Version 1909affected: 10.0.0 before 10.0.18363.1734CVE List
  • Windows 10 Version 2004affected: 10.0.0 before 10.0.19041.1165CVE List
  • Windows 10 Version 20H2affected: 10.0.0 before 10.0.19042.1165CVE List
  • Windows 10 Version 21H1affected: 10.0.0 before 10.0.19043.1165CVE List
  • Windows Server 2019affected: 10.0.17763.0 before 10.0.17763.2114CVE List
  • Windows Server 2019 (Server Core installation)affected: 10.0.17763.0 before 10.0.17763.2114CVE List
  • Windows Server version 2004affected: 10.0.0 before 10.0.19041.1165CVE List
  • Windows Server version 20H2affected: 10.0.0 before 10.0.19042.1165CVE List

References 4