CVEvulnerability

CVE-2021-43226

7.8 HIGH Known exploited Published 2021-12-15 Modified 2026-08-22 Official page ↗

CISA Known Exploited Vulnerability

Microsoft Windows Privilege Escalation Vulnerability — Microsoft Windows

Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.

Added to KEV
2025-10-06
Remediation due
2025-10-27
Ransomware use
Known
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43226 ; https://nvd.nist.gov/vuln/detail/CVE-2021-43226
Status
Analyzed
Published
2021-12-15
Last modified
2026-08-22
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
4.6 MEDIUM — AV:L/AC:L/Au:N/C:P/I:P/A:P

Description

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Affected configurations

• microsoft windows 10 1507 (< 10.0.10240.19145) • microsoft windows 10 1607 (< 10.0.14393.4825) • microsoft windows 10 1809 (< 10.0.17763.2366) • microsoft windows 10 1909 (< 10.0.18363.1977) • microsoft windows 10 2004 (< 10.0.19041.1415) • microsoft windows 10 20h2 (< 10.0.19042.1415) • microsoft windows 10 21h1 (< 10.0.19043.1415) • microsoft windows 10 21h2 (< 10.0.19044.1415) • microsoft windows 11 21h2 (< 10.0.22000.376) • microsoft windows 7 • microsoft windows 8.1 • microsoft windows rt 8.1 • microsoft windows server 2004 (< 10.0.19041.1415) • microsoft windows server 2008 • microsoft windows server 2008 r2 • microsoft windows server 2012 • microsoft windows server 2012 r2 • microsoft windows server 2016 (< 10.0.14393.4825) • microsoft windows server 2019 (< 10.0.17763.2366) • microsoft windows server 2022 (< 10.0.20348.405) • microsoft windows server 20h2 (< 10.0.19042.1415)

References