Local privilege escalation via ssh-agent input validation
Published Apr 8, 2025 · Updated Aug 10, 2026
Improper input validation in OpenSSH for Windows on affected Windows releases allows local users to elevate privileges through ssh-agent. Microsoft identifies ssh-agent as the affected component but has not published the malformed input, validation error, or privileged operation that enables the escalation. Exploitation requires existing low-privilege local access, needs no user interaction, and can compromise confidentiality, integrity, and availability in the elevated context.
Summary
What happened
Improper input validation in OpenSSH for Windows on affected Windows releases allows local users to elevate privileges through ssh-agent. Microsoft identifies ssh-agent as the affected component but has not published the malformed input, validation error, or privileged operation that enables the escalation. Exploitation requires existing low-privilege local access, needs no user interaction, and can compromise confidentiality, integrity, and availability in the elevated context.
The record
- CVE
- CVE-2025-27731
- Published
- Apr 8, 2025
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-20, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 8, 2025CVE publishedPublication date reported by the CVE source.
- Aug 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 <10.0.17763.7136
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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