Windows
CVE-2025-29824
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Memory lifecycle management
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | High risk (CVSS 7.8). The CLFS driver has had numerous exploitation incidents in 2023-2025, making it a favored kernel attack surface for ransomware operators and APT groups. The recurring nature suggests fundamental architectural issues. |
| Exploit ScenarioDerived | Ransomware operators use the CLFS exploit to escalate from a compromised user account to SYSTEM privileges, enabling disabling of security products and encryption of the entire system. |
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Alert meAnalysisAIv1 – Mar 28, 2026
Windows Common Log File System Driver contains a use-after-free enabling local privilege escalation, exploited in the wild in April 2025. CLFS driver vulnerabilities have become a recurring Windows kernel exploit target.
Earlier versions of this analysis (1)
A use-after-free in the Windows CLFS driver enables authorized local attackers to escalate to SYSTEM. Part of the ongoing series of CLFS driver vulnerabilities exploited in the wild.
RemediationAI
Apply April 2025 Patch Tuesday updates. Monitor for CLFS exploitation indicators. Consider restricting CLFS access through Exploit Guard policies.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The CWE-416 use-after-free in clfs.sys occurs during log file processing. CLFS has become one of the most frequently exploited Windows kernel components due to complex state management in its log file structures.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
Executive ViewAI
Organizations using Use after free in Windows Common Log File System Driver face notable risk from CVE-2025-29824, a use-after-free vulnerability rated CVSS 7.8. Exploitation could compromise the security of affected deployments. This vulnerability is actively exploited in the wild (KEV-listed) and requires immediate remediation. Immediate patching is required per CISA KEV mandate.
Apply vendor patch. If immediate patching is not feasible: (1) Enable ASLR and DEP where available; (2) Implement network segmentation; (3) Monitor for exploitation indicators.
Threat Intelligence Overview
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.
Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)CVE.org
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GitHub PoC
Exploit-DB