CVE-2025-5372
MediumCVSS 5.0Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
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, the function may mistakenly return a success status even when key derivation fails.
Risk Assessment
This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.
Recommendation
It is recommended to update libssh to a version built with OpenSSL 3.0 or newer to eliminate this issue.
Original NVD description (English source)
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.