SYSTEM privilege escalation via unchecked reparse records
Published Nov 14, 2023 · Updated Apr 14, 2026
Out-of-bounds read in the Windows CLFS driver allows local users with low privileges to gain SYSTEM access through crafted reparse data. The reparse-buffer path validates only the first ten records before copying later attacker-controlled records into a fixed 0x4000-byte kernel pool. Exploitation requires local low-privilege code execution and permits kernel memory manipulation and SYSTEM token theft without user interaction.
Summary
What happened
Out-of-bounds read in the Windows CLFS driver allows local users with low privileges to gain SYSTEM access through crafted reparse data. The reparse-buffer path validates only the first ten records before copying later attacker-controlled records into a fixed 0x4000-byte kernel pool. Exploitation requires local low-privilege code execution and permits kernel memory manipulation and SYSTEM token theft without user interaction.
The record
- CVE
- CVE-2023-36424
- Published
- Nov 14, 2023
- Updated
- Apr 14, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-125, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 14, 2023CVE publishedPublication date reported by the CVE source.
- Apr 14, 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 <10.0.10240.20308
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.
Public exploit references
- Windows Kernel Pool clfs.sys Corruption Privilege Escalationfunctional · demonstrated
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Reported exploitation
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
Technologies
Your stack
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Your stack
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