VULNERABILITY INTELLIGENCE

CVE-2025-5372

CVSS score5 MEDIUM
EPSS probability0.50%
CISA KEVNot currently listed
Published2025-07-04
Last modified2026-09-01
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

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.

Weakness classification

  • CWE-682: Incorrect Calculation

Primary references