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CVE-2025-5372

Libssh: incorrect return code handling in ssh_kdf() in libssh

Published: Jul 4, 2025Updated: Jun 15, 2026 Sources: CVE List NVD BDUCWE-682
NVD MITRE
5.0CVSSMEDIUM
EPSS Score
0.4%
Top 67.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-682

Affected Products

Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
Suse Linux Enterprise ServerNovell Inc.
On-premOS
Operating Systems / linux-distro
SUSE Linux Enterprise Server for SAP ApplicationsNovell Inc.
On-premOS
Operating Systems / linux-distro
SUSE Linux Enterprise Module for BasesystemNovell Inc.
On-premOS
Operating Systems / linux-distro
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
red hat inc.commercialUSOperating Systemsaka red hat
novell inc.commercialUSOperating Systems
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
and 34 more affected products View all →

Exploitability

Official Patch Available
Workaround Available

References

https://git.libssh.org/projects/libssh.git/commit/?id=a9d8a3d44829cf9182b252bc951f35fb0d573972
git.libssh.org
https://www.libssh.org/security/advisories/CVE-2025-5372.txt
libssh.org
https://altsp.su/obnovleniya-bezopasnosti/
altsp.su
and 19 more references View all →

Timeline

Published
Jul 4, 2025
Last Updated
Jun 15, 2026

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