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

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Summary

CVECVE-2025-5372
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-07-04 06:15:24 UTC
Updated2026-06-15 03:16:22 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.003010000 probability, percentile 0.539930000 (date 2026-06-14)

Problem Types: CWE-682 | CWE-682 Incorrect Calculation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary5MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
3.1CNACVSS5MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Libssh Libssh All All All All
Operating System Redhat Enterprise Linux 10.0 All All All
Operating System Redhat Enterprise Linux 6.0 All All All
Operating System Redhat Enterprise Linux 7.0 All All All
Operating System Redhat Enterprise Linux 8.0 All All All
Operating System Redhat Enterprise Linux 9.0 All All All
Application Redhat Openshift Container Platform 4.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Libssh Libssh affected 0.11.2 semver Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:0.9.6-16.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:0.9.6-16.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:0.9.4-2.el8_4.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:0.9.4-2.el8_4.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:0.9.6-4.el8_6.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On unaffected 0:0.9.6-4.el8_6.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:0.9.6-13.el8_8.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:0.9.6-13.el8_8.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions unaffected 0:0.9.6-3.el9_0.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2025:23024 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2025:21977 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com Issue Tracking, Third Party Advisory
access.redhat.com/errata/RHSA-2026:24349 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:25911 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:20610 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2025-5372 [email protected] access.redhat.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2025-05-30T11:26:05.731ZReported to Red Hat.
CNA2025-06-24T00:00:00.000ZMade public.

Workarounds

CNA: To mitigate this issue, administrators should ensure that libssh is built against OpenSSL version 3.0 or later. This change eliminates the return code mismatch and prevents the erroneous use of uninitialized key material. It is also strongly recommended to apply vendor supplied patches or update to the latest libssh security release as soon as possible.

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