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CVE-2021-43226

HighPublished

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Published: Dec 15, 2021
Updated: Aug 22, 2026
Assigning CNA: microsoft
Evidence observed: Oct 6, 2025

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

3.1%

Low · next 30 days

Percentile: 87.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Sources

cve-2021-43226PoCPoC
a Proof of Concept of cve-2021-43226,stack overflow in Windows driver clfs.sys

Responsible use

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