CVE-2025-5372
Libssh: incorrect return code handling in ssh_kdf() in libssh
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.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:LPrivileges RequiredLow
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:LConfidentialityLow
I:LIntegrityLow
A:LAvailabilityLow
Weaknesses
Affected Products
Red Hat Inc.
commercial·USaka redhat, Red Hat
Novell Inc.
commercial·US
АО «НТЦ ИТ РОСА»
commercial·RU
Fedora Project
oss-project·USaka fedora
libssh
oss-projectaka libssh2 (related, sometimes confused)
and 15 more affected products View all →
Exploitability
Official Patch Available
Workaround Available
References
https://access.redhat.com/errata/RHSA-2025:21977
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:23024
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:20610
access.redhat.com
and 19 more references View all →
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