Local privilege escalation via CLFS heap overflow
Published May 13, 2025 · Updated Feb 26, 2026
Heap-based buffer overflow in the Microsoft Windows CLFS Driver allows local users to elevate privileges on affected Windows systems. Improper input validation in the driver permits the overflow, but Microsoft has not disclosed the affected function, field, or copy operation. Low-privileged local access is required; successful exploitation elevates privileges and can compromise the host.
Summary
What happened
Heap-based buffer overflow in the Microsoft Windows CLFS Driver allows local users to elevate privileges on affected Windows systems. Improper input validation in the driver permits the overflow, but Microsoft has not disclosed the affected function, field, or copy operation. Low-privileged local access is required; successful exploitation elevates privileges and can compromise the host.
The record
- CVE
- CVE-2025-32706
- Published
- May 13, 2025
- Updated
- Feb 26, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-20, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 13, 2025Exploitation reportedCISA Known Exploited Vulnerabilities Catalog entry
- May 13, 2025CVE publishedPublication date reported by the CVE source.
- Feb 26, 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 <10.0.10240.21014
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities Catalog entryknown exploited catalog
Technologies
Your stack
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Your stack
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