CVE-2021-43226

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Affected

Microsoft · Windows 10 Version 1809 · Windows Server 2019 · Windows Server 2019 (Server Core installation) · Windows 10 Version 1909 · Windows 10 Version 21H1 · Windows Server 2022

CVSS v3.1 NVD

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 NVD

4.6 MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS

3.28% chance of exploitation in the next 30 days, 88th percentile

CISA KEV

added 2025-10-06, used in ransomware campaigns

Published

2021-12-15

Updated

2026-08-22

Proof-of-concept exploits (2)

• KaLendsi/CVE-2021-43224-POC94★ · 2021-12-21
• Rosayxy/cve-2021-43226PoC2★ · 2023-10-30

Security advisories

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

References

• CVE Record
• NVD entry

Related

• CVE-2020-1020
• CVE-2020-1054
• CVE-2021-1732
• CVE-2021-34486
• CVE-2021-40449
• CVE-2021-43224