CVE-2025-5372 Information

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 Vector

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

Reference

https://access.redhat.com/security/cve/CVE-2025-5372 https://bugzilla.redhat.com/show_bug.cgi?id=2369388

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

LOW

Base Severity

5.0