---
id: CVE-2025-5372
title: >-
  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
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 f…
severity: medium
cvss: 5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-682
vendor: libssh
product: libssh
affected:
  - libssh < 0.11.2
  - openshift_container_platform = 4.0
  - enterprise_linux = 6.0
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux = 10.0
patched:
  - libssh 0.11.2
published: '2025-07-04'
updated: '2026-06-17'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-5372'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2025:21977'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23024'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:20610'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:24349'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:25911'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2025-5372'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2369388'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00466
epssPercentile: 0.3764
ingestedAt: '2026-08-21T13:17:17.952Z'
---

## Overview

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

- `libssh < 0.11.2`
- `openshift_container_platform = 4.0`
- `enterprise_linux = 6.0`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `libssh 0.11.2`