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CVE-2021-43226

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Basic Information

CVE State
PUBLISHED
Reserved Date
November 02, 2021
Published Date
December 15, 2021
Last Updated
October 21, 2025
Vendor
Microsoft
Product
Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows 10 Version 21H1, Windows Server 2022, Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2, Windows 11 version 21H2, Windows 10 Version 21H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)
Description
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Tags
cisa

CVSS Scores

CVSS v3.1

7.8 - HIGH

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

SSVC Information

Exploitation
active
Technical Impact
total

Exploit Status

Exploited in the Wild
Yes (2026-06-01 10:41:42 UTC) Source

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43226

Known Exploited Vulnerability Information

Source Added Date
CVE 2026-06-01 10:41:42 UTC

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Added to KEVIntel