Local privilege escalation via freed object reuse
Published May 13, 2025 · Updated Feb 13, 2026
Use-after-free in Microsoft Brokering File System on affected Windows builds allows local users to elevate privileges. Microsoft identifies freed-memory reuse in the Brokering File System but has not published the affected object, function, or triggering operation. A low-privileged local user can exploit the flaw without user interaction to gain elevated control over confidentiality, integrity, and availability.
Summary
What happened
Use-after-free in Microsoft Brokering File System on affected Windows builds allows local users to elevate privileges. Microsoft identifies freed-memory reuse in the Brokering File System but has not published the affected object, function, or triggering operation. A low-privileged local user can exploit the flaw without user interaction to gain elevated control over confidentiality, integrity, and availability.
The record
- CVE
- CVE-2025-29970
- Published
- May 13, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 13, 2025CVE publishedPublication date reported by the CVE source.
- Feb 13, 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=10.0.26100.0 <10.0.26100.4061
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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