CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities catalog.

Remediation Deadline: Oct 27, 2025

CVE-2021-43226

High

EPSS 7.3%CISA KEV

Description

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

EPSS — Exploit Probability

7.3%

Higher than 91.6% of all CVEs

Required Action

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43226 ; https://nvd.nist.gov/vuln/detail/CVE-2021-43226

Risk Assessment

ELEVATED

In CISA KEV

Details

Severity: High
EPSS: 7.3%
CISA KEV: Yes
Ransomware: Unknown
Articles: 0

Timeline

Published

Oct 6, 2025

Added to KEV

Oct 6, 2025

Remediation Due

Oct 27, 2025

Affected Product

Microsoft

Windows

View all Microsoft CVEs

External Links

NVD (NIST)CVE Details MITRE CVE