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Not yet scored Actively exploited Used in ransomware

CVE-2021-43226

Microsoft Windows Privilege Escalation Vulnerability

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.

Recommended 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.

CISA remediation due date for U.S. federal agencies: 27 Oct 2025.

Collected automatically from public sources. Verify affected versions and fixes in the vendor's notice before acting.