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CVE-2021-31955

Microsoft Windows Kernel Information Disclosure Vulnerability

Microsoft WindowsOperating systems
Open in ThreatlineRecord JSON
CVSS
5.5Medium
ExploitationExploited in the wildAdded to KEV 3 Nov 2021CISA KEV
Exploit odds (EPSS)81.1%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.17763.1999Also 10.0.18363.1621, 10.0.19043.1052 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

  • 10.0.17763.1999Windows 10 Version 1809CVE List
  • 10.0.17763.1999Windows Server 2019CVE List
  • 10.0.17763.1999Windows Server 2019 (Server Core installation)CVE List
  • 10.0.18363.1621Windows 10 Version 1909CVE List
  • 10.0.19043.1052Windows 10 Version 21H1CVE List
  • 10.0.19041.1052Windows 10 Version 2004CVE List
Show all 9 fixed versions
  • 10.0.19041.1052Windows Server version 2004CVE List
  • 10.0.19042.1052Windows 10 Version 20H2CVE List
  • 10.0.19042.1052Windows 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. 8 Jun 2021, 22:46 UTCPublishedCVE List
  2. 3 Nov 2021Added to CISA KEVCISA KEV

Description

Microsoft Windows Kernel contains an unspecified vulnerability that allows for information disclosure. Successful exploitation allows attackers to read the contents of kernel memory from a user-mode process.

Text from CVE List

Affected versions 9

  • Windows 10 Version 1809affected: 10.0.0 before 10.0.17763.1999CVE List
  • Windows Server 2019affected: 10.0.0 before 10.0.17763.1999CVE List
  • Windows Server 2019 (Server Core installation)affected: 10.0.0 before 10.0.17763.1999CVE List
  • Windows 10 Version 1909affected: 10.0.0 before 10.0.18363.1621CVE List
  • Windows 10 Version 21H1affected: 10.0.0 before 10.0.19043.1052CVE List
  • Windows 10 Version 2004affected: 10.0.0 before 10.0.19041.1052CVE List
  • Windows Server version 2004affected: 10.0.0 before 10.0.19041.1052CVE List
  • Windows 10 Version 20H2affected: 10.0.0 before 10.0.19042.1052CVE List
  • Windows Server version 20H2affected: 10.0.0 before 10.0.19042.1052CVE List

References 3