CVE-2025-5372
MEDIUM severity · CVSS 5 · CWE-682
5CVSS MEDIUM
Summary
A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredLow
User interactionNone
Confidentiality impactLow
Integrity impactLow
Availability impactLow
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Affected products we track (2)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://access.redhat.com/errata/RHSA-2025:21977
- https://access.redhat.com/errata/RHSA-2025:23024
- https://access.redhat.com/errata/RHSA-2026:20610
- https://access.redhat.com/errata/RHSA-2026:24349
- https://access.redhat.com/errata/RHSA-2026:25911
- https://access.redhat.com/security/cve/CVE-2025-5372Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2369388Advisory