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CVE record · CVE-2021-36948

Windows Update Medic Service Elevation of Privilege Vulnerability

CVSS 7.8 HighCriticalIn CISA KEVEPSS 0.23 · 97th percentile

Critical, because:

  • In CISA’s KEV catalogue since 3 Nov 2021: it is known to be exploited.
  • CVSS score 7.8 (7.0 or more) and EPSS 0.23 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 12 Aug 2021, 18:12 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Windows 10 Version 1809
  • affected 10.0.17763.0 to before 10.0.17763.2114 custom
Microsoft Windows 10 Version 1809
  • affected 10.0.0 to before 10.0.17763.2114 custom
Microsoft Windows 10 Version 1909
  • affected 10.0.0 to before 10.0.18363.1734 custom
Microsoft Windows 10 Version 2004
  • affected 10.0.0 to before 10.0.19041.1165 custom
Microsoft Windows 10 Version 20H2
  • affected 10.0.0 to before 10.0.19042.1165 custom
Microsoft Windows 10 Version 21H1
  • affected 10.0.0 to before 10.0.19043.1165 custom
Microsoft Windows Server 2019
  • affected 10.0.17763.0 to before 10.0.17763.2114 custom
Microsoft Windows Server 2019 (Server Core installation)
  • affected 10.0.17763.0 to before 10.0.17763.2114 custom
Microsoft Windows Server version 2004
  • affected 10.0.0 to before 10.0.19041.1165 custom
Microsoft Windows Server version 20H2
  • affected 10.0.0 to before 10.0.19042.1165 custom
Identifiers
CVE-2021-36948
CNA
microsoft
Tags
Published
12 Aug 2021
Updated
10 Aug 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.8 High 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C CNA (microsoft)
  • CISA KEV Listed since 3 Nov 2021: known to be exploited.
  • EPSS 0.23, the 97th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 12 Aug 2021. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.