CVE-2025-5372

Published: Jul 4, 2025

Modified: May 26, 2026

PUBLISHED

CVSS v3.1

5.0

MEDIUM

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.

Vendor	Product	Versions
libssh	libssh	affected `0 - < 0.11.2`
Red Hat	Red Hat Enterprise Linux 8	unaffected `0:0.9.6-16.el8_10 - < *`
Red Hat	Red Hat Enterprise Linux 8	unaffected `0:0.9.6-16.el8_10 - < *`
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	unaffected `0:0.9.6-13.el8_8.2 - < *`
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	unaffected `0:0.9.6-13.el8_8.2 - < *`
Red Hat	Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions	unaffected `0:0.9.6-3.el9_0.2 - < *`
Red Hat	Red Hat Enterprise Linux 10	All versions
Red Hat	Red Hat Enterprise Linux 6	All versions
Red Hat	Red Hat Enterprise Linux 7	All versions
Red Hat	Red Hat Enterprise Linux 9	All versions
Red Hat	Red Hat OpenShift Container Platform 4	All versions