All vulnerabilities
CVE-2021-36934

Microsoft Windows SAM Local Privilege Escalation Vulnerability

Microsoft WindowsOperating systems
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationExploited in the wildAdded to KEV 10 Feb 2022CISA KEV
Exploit odds (EPSS)67.3%Chance of exploitation activity in the next 30 days, higher than 99% 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 deadline24 Feb 2022Remediation 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

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. 22 Jul 2021, 07:05 UTCPublishedCVE List
  2. 10 Feb 2022Added to CISA KEVCISA KEV

Description

If a Volume Shadow Copy (VSS) shadow copy of the system drive is available, users can read the SAM file which would allow any user to escalate privileges to SYSTEM level.

Text from CVE List

Affected versions 6

  • 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

References 5