CVE-2022-24521VulnerabilityPublished 04/13/2022Updated 10/24/2026

CVE-2022-24521: Microsoft Windows CLFS Driver Privilege Escalation Vulnerability

Affects Microsoft WindowsSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 04/13/2022
KEV deadline: 05/04/2022
Ransomware: Used in ransomware campaigns
EPSS: 7.1% chance of exploitation in 30 days – higher than 94% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2022-24521 (opens in a new tab)

Description

CVE-2022-24521 is a high-severity privilege escalation vulnerability in the Microsoft Windows Common Log File System (CLFS) Driver. The vulnerability is unspecified in detail but has been exploited in the wild and is known to be used in ransomware campaigns. No specific affected Windows versions or patch information is provided in the available data.

Summary

Microsoft Windows Common Log File System (CLFS) Driver contains an unspecified vulnerability that allows an attacker to escalate privileges on the affected system. The vulnerability is tracked as CVE-2022-24521 and has been confirmed to be exploited in the wild, including use in ransomware campaigns. The vulnerability is associated with weaknesses categorized under CWE-787 (Out-of-bounds Write) and CWE-1285 (Improper Access Control). No vendor advisory or patch information is provided in the input data.

Impact

Successful exploitation of this vulnerability allows an attacker to escalate privileges on a Windows system, potentially gaining elevated rights that could enable further malicious actions such as installing malware or ransomware. The vulnerability has been actively exploited in the wild, increasing the risk to affected systems.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Due to the lack of explicit patch or mitigation information, organizations should monitor official Microsoft security advisories for updates and apply any released patches promptly. Until a fix is available, limit exposure by restricting access to vulnerable systems and applying principle of least privilege.

CVE-2022-24521: Microsoft Windows CLFS Driver Privilege Escalation Vulnerability

What to do

Description

Summary

Impact

Mitigation

Weaknesses

References

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 11:26:41 UTC

Weaknesses

References

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