SYSTEM elevation via attacker-controlled CLFS pointer dereference
Published Dec 10, 2024 · Updated Jun 9, 2026
Heap-based buffer overflow in the Windows CLFS driver allows local users with low privileges to execute code as SYSTEM via a crafted log file. Overlapping BLF header regions make ClfsEncodeBlock alter pContainer before ClfsDecodeBlock fails, after which LoadContainerQ dereferences the attacker-controlled pointer. Local low-privilege access and no user interaction are required; successful exploitation grants kernel memory access and full SYSTEM control.
Summary
What happened
Heap-based buffer overflow in the Windows CLFS driver allows local users with low privileges to execute code as SYSTEM via a crafted log file. Overlapping BLF header regions make ClfsEncodeBlock alter pContainer before ClfsDecodeBlock fails, after which LoadContainerQ dereferences the attacker-controlled pointer. Local low-privilege access and no user interaction are required; successful exploitation grants kernel memory access and full SYSTEM control.
The record
- CVE
- CVE-2024-49138
- Published
- Dec 10, 2024
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-122, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 10, 2024CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.10240.0 <10.0.10240.20857
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- CVE-2024-49138-POCfunctional · demonstrated
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Reported exploitation
- CISA Known Exploited Vulnerabilities catalog entryknown exploited catalog
Technologies
Your stack
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Your stack
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