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Vulnerability record · CVE-2023-6918 · published 19 December 2023

CVE-2023-6918: Libssh unchecked return value vulnerability

Libssh · Libssh

A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.

5.3 CVSS 3.1 Medium EPSS 1.4% · top 28.4% CWE-252 · Unchecked return value
5.3CVSS 3.1 base score
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
15References
17 Jun 2026Last modified by NVD

Description

A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2024:2504
https://access.redhat.com/errata/RHSA-2024:3233
https://access.redhat.com/security/cve/CVE-2023-6918 Mailing ListVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254997 Issue TrackingThird Party Advisory
https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/ Release Notes
https://www.libssh.org/security/advisories/CVE-2023-6918.txt Vendor Advisory
https://access.redhat.com/errata/RHSA-2024:2504
https://access.redhat.com/errata/RHSA-2024:3233
https://access.redhat.com/security/cve/CVE-2023-6918 Mailing ListVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254997 Issue TrackingThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/LZQVUHWVWRH73YBXUQJOD6CKH
https://lists.fedoraproject.org/archives/list/[email protected]/message/MKQRBF3DWMWPH36LBCOBUTSIZ
https://security.netapp.com/advisory/ntap-20250214-0009/
https://www.libssh.org/2023/12/18/libssh-0-10-6-and-libssh-0-9-8-security-releases/ Release Notes
https://www.libssh.org/security/advisories/CVE-2023-6918.txt Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-6918), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.