Local privilege escalation through undisclosed input validation
Published Mar 10, 2026 · Updated Mar 10, 2026
Improper input-type validation in Microsoft Windows AFD allows local users with low privileges to elevate privileges on affected systems. Microsoft identifies the locus as the Ancillary Function Driver for WinSock but has not disclosed which input type is accepted incorrectly or the responsible routine. Exploitation requires local low-privileged access and high-complexity conditions; no interaction by another user is required.
Summary
What happened
Improper input-type validation in Microsoft Windows AFD allows local users with low privileges to elevate privileges on affected systems. Microsoft identifies the locus as the Ancillary Function Driver for WinSock but has not disclosed which input type is accepted incorrectly or the responsible routine. Exploitation requires local low-privileged access and high-complexity conditions; no interaction by another user is required.
The record
- CVE
- CVE-2026-25179
- Published
- Mar 10, 2026
- Updated
- Mar 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-1287, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 10, 2026CVE publishedPublication date reported by the CVE source.
- Mar 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=10.0.17763.0 <10.0.17763.8511
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.
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Technologies
Your stack
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Your stack
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