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Vulnerability · Published Jul 4, 2025 · Assigned by redhat

CVE-2025-5372Libssh: incorrect return code handling in ssh_kdf() in libssh

Medium 5.0

In plain English

A medium-severity security flaw in libssh from libssh. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.0Medium
Exploit odds (30 days)0.5%top 56.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8libssh0.9.6-16.el8_10ALSA-2025:21977
AlmaLinux:8libssh-config0.9.6-16.el8_10ALSA-2025:21977
AlmaLinux:8libssh-devel0.9.6-16.el8_10ALSA-2025:21977
Alpine:v3.22libssh0.11.2-r0ALPINE-CVE-2025-5372
Alpine:v3.23libssh0.11.2-r0ALPINE-CVE-2025-5372
Alpine:v3.24libssh0.11.2-r0ALPINE-CVE-2025-5372
Debian:12libssh0.10.6-0+deb12u2DEBIAN-CVE-2025-5372
Debian:13libssh0.11.2-1DEBIAN-CVE-2025-5372
Debian:14libssh0.11.2-1DEBIAN-CVE-2025-5372
Rocky Linux:8libssh0:0.9.6-16.el8_10RLSA-2025:21977
Ubuntu:22.04:LTSlibssh0.9.6-2ubuntu0.22.04.4USN-7619-1
Ubuntu:22.04:LTSlibssh0.9.6-2ubuntu0.22.04.4UBUNTU-CVE-2025-5372
Ubuntu:24.04:LTSlibssh0.10.6-2ubuntu0.1USN-7619-1
Ubuntu:24.04:LTSlibssh0.10.6-2ubuntu0.1UBUNTU-CVE-2025-5372

Affected products (as reported)

VendorProductVersions
libssh libssh 0 – before 0.11.2
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-682 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

References