Local privilege escalation via NEGOEX integer overflow
Published Sep 9, 2025 · Updated Sep 9, 2025
Integer overflow in Windows SPNEGO Extended Negotiation allows local users to elevate privileges on affected Windows systems. Microsoft has not disclosed the affected function, the incorrect integer operation, or how the separately mapped TOCTOU race reaches that operation. Exploitation requires existing low-privileged local access and high-complexity conditions; success grants elevated control over the system.
Summary
What happened
Integer overflow in Windows SPNEGO Extended Negotiation allows local users to elevate privileges on affected Windows systems. Microsoft has not disclosed the affected function, the incorrect integer operation, or how the separately mapped TOCTOU race reaches that operation. Exploitation requires existing low-privileged local access and high-complexity conditions; success grants elevated control over the system.
The record
- CVE
- CVE-2025-54895
- Published
- Sep 9, 2025
- Updated
- Sep 9, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-367, CWE-190, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 9, 2025CVE publishedPublication date reported by the CVE source.
- Sep 9, 2025Record 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 <10.0.10240.21128
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.
Technologies
Your stack
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Your stack
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