SYSTEM privilege escalation via crafted BLF metadata
Published Sep 13, 2022 · Updated Sep 10, 2026
Out-of-bounds write in the Microsoft Windows CLFS driver allows local users to gain SYSTEM privileges through a crafted base log file. CLFS.sys trusts manipulated SignaturesOffset metadata, bypasses cbSymbolZone bounds validation, and writes beyond the allocated symbol region. A low-privileged local account can corrupt kernel objects and replace its process token, while malformed attempts can instead crash the host.
Summary
What happened
Out-of-bounds write in the Microsoft Windows CLFS driver allows local users to gain SYSTEM privileges through a crafted base log file. CLFS.sys trusts manipulated SignaturesOffset metadata, bypasses cbSymbolZone bounds validation, and writes beyond the allocated symbol region. A low-privileged local account can corrupt kernel objects and replace its process token, while malformed attempts can instead crash the host.
The record
- CVE
- CVE-2022-37969
- Published
- Sep 13, 2022
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-20, CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 2, 2022Exploitation reportedZscaler ThreatLabz zero-day observation
- Sep 13, 2022CVE publishedPublication date reported by the CVE source.
- Sep 10, 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 <10.0.10240.19444
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
- Fortra CVE-2022-37969 Windows LPE exploitfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
- Zscaler ThreatLabz zero-day observationreported exploitation
Technologies
Your stack
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Your stack
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