Junglewise Threat Intelligence

CVE-2021-33771: Microsoft Windows Kernel Privilege Escalation Vulnerability

CVE-2021-33771 · Severity: critical · CVSS 7.8 · Exploited in the wild · Published 2021-11-03

Technologies: Microsoft Windows, Microsoft Windows 10 Version 1607, Microsoft Windows 10, Microsoft Windows Server 2012 R2, Microsoft Windows 8.1, Microsoft Windows Server 2019, Microsoft Windows Server 2008, Microsoft Windows Server 2016, Microsoft Windows 10 Version 1809, Microsoft Windows Rt 8.1. Vendors: Microsoft.

Executive brief

A privilege escalation vulnerability exists in the Microsoft Windows Kernel that allows a local attacker to gain elevated permissions. The vulnerability has been observed being exploited in the wild and is included in CISA's Known Exploited Vulnerabilities Catalog.

Affected products

  • Microsoft Windows 10 up to (excluding) 10.0.10240.19003
  • Microsoft Windows 10 Version 1607 up to (excluding) 10.0.14393.4530
  • Microsoft Windows 10 Version 1809 up to (excluding) 10.0.17763.2061
  • Microsoft Windows 10 Version 1909 up to (excluding) 10.0.18363.1679
  • Microsoft Windows 10 Version 2004 up to (excluding) 10.0.19041.1110
  • Microsoft Windows 10 Version 20H2 up to (excluding) 10.0.19042.1110
  • Microsoft Windows 10 Version 21H1 up to (excluding) 10.0.19043.1110
  • Microsoft Windows 8.1
  • Microsoft Windows RT 8.1
  • Microsoft Windows Server 2004 up to (excluding) 10.0.19041.1110
  • Microsoft Windows Server 2008
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2016 up to (excluding) 10.0.14393.4530
  • Microsoft Windows Server 2019 up to (excluding) 10.0.17763.2061
  • Microsoft Windows Server 20H2 up to (excluding) 10.0.19042.1110

Timeline

  • 2021-07-16: disclosed: Initial analysis by NIST
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: advisory: Published date reported in advisory summary

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