All vulnerabilities
CVE-2021-33771

Microsoft Windows Kernel 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)10.2%Chance of exploitation activity in the next 30 days, higher than 95% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.10240.19003Also 10.0.14393.4530, 10.0.17763.2061 and 5 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

  • 10.0.10240.19003Windows 10 Version 1507CVE List
  • 10.0.14393.4530Windows 10 Version 1607CVE List
  • 10.0.17763.2061Windows 10 Version 1809CVE List
  • 10.0.18363.1679Windows 10 Version 1909CVE List
  • 10.0.19041.1110Windows 10 Version 2004CVE List
  • 10.0.19042.1110Windows 10 Version 20H2CVE List
Show all 16 fixed versions
  • 10.0.19043.1110Windows 10 Version 21H1CVE List
  • 6.3.9600.20069Windows 8.1CVE List
  • 6.3.9600.20069Windows Server 2012 R2CVE List
  • 6.3.9600.20069Windows Server 2012 R2 (Server Core installation)CVE List
  • 10.0.14393.4530Windows Server 2016CVE List
  • 10.0.14393.4530Windows Server 2016 (Server Core installation)CVE List
  • 10.0.17763.2061Windows Server 2019CVE List
  • 10.0.17763.2061Windows Server 2019 (Server Core installation)CVE List
  • 10.0.19041.1110Windows Server version 2004CVE List
  • 10.0.19042.1110Windows 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. 14 Jul 2021, 17:53 UTCPublishedCVE List
  2. 3 Nov 2021Added to CISA KEVCISA KEV

Description

Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.

Text from CVE List

Affected versions 17

  • Windows 10 Version 1507affected: 10.0.10240.0 before 10.0.10240.19003CVE List
  • Windows 10 Version 1607affected: 10.0.14393.0 before 10.0.14393.4530CVE List
  • Windows 10 Version 1809affected: 10.0.17763.0 before 10.0.17763.2061CVE List
  • Windows 10 Version 1809affected: 10.0.0 before 10.0.17763.2061CVE List
  • Windows 10 Version 1909affected: 10.0.0 before 10.0.18363.1679CVE List
  • Windows 10 Version 2004affected: 10.0.0 before 10.0.19041.1110CVE List
  • Windows 10 Version 20H2affected: 10.0.0 before 10.0.19042.1110CVE List
  • Windows 10 Version 21H1affected: 10.0.0 before 10.0.19043.1110CVE List
  • Windows 8.1affected: 6.3.0 before 6.3.9600.20069CVE List
  • Windows Server 2012 R2affected: 6.3.9600.0 before 6.3.9600.20069CVE List
  • Windows Server 2012 R2 (Server Core installation)affected: 6.3.9600.0 before 6.3.9600.20069CVE List
  • Windows Server 2016affected: 10.0.14393.0 before 10.0.14393.4530CVE List
  • Windows Server 2016 (Server Core installation)affected: 10.0.14393.0 before 10.0.14393.4530CVE List
  • Windows Server 2019affected: 10.0.17763.0 before 10.0.17763.2061CVE List
  • Windows Server 2019 (Server Core installation)affected: 10.0.17763.0 before 10.0.17763.2061CVE List
  • Windows Server version 2004affected: 10.0.0 before 10.0.19041.1110CVE List
  • Windows Server version 20H2affected: 10.0.0 before 10.0.19042.1110CVE List

References 4