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Vulnerability record · CVE-2025-5372 · published 4 July 2025

CVE-2025-5372: Libssh vulnerability

Libssh · Libssh

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.

8.8 CVSS 3.1 High EPSS 0.47% · top 62.2% CWE-682 · CWE-682
8.8CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
7References
1 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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-2025-5372 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2369388 Issue TrackingThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-5372), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.