CVE-2023-6918

Name: CVE-2023-6918
Creator: NVD / NIST
Published: 2023-12-19T00:15:08.46+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.42%

Last modified Jun 17, 2026

CVE-2023-6918 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 1.42% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.42%

69.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Libssh	Libssh	>= 0.9.0, < 0.9.8
Libssh	Libssh	>= 0.10.0, < 0.10.6
Fedoraproject	Fedora	38
Fedoraproject	Fedora	39
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux	9.0

References

https://access.redhat.com/errata/RHSA-2024:2504
https://access.redhat.com/errata/RHSA-2024:3233
https://access.redhat.com/security/cve/CVE-2023-6918Mailing List, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254997Issue Tracking, Third 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.txtVendor Advisory
https://access.redhat.com/errata/RHSA-2024:2504
https://access.redhat.com/errata/RHSA-2024:3233
https://access.redhat.com/security/cve/CVE-2023-6918Mailing List, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254997Issue Tracking, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LZQVUHWVWRH73YBXUQJOD6CKHDQBU3DM/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MKQRBF3DWMWPH36LBCOBUTSIZRTPEZXB/
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.txtVendor Advisory

Timeline

Published: Dec 19, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-6918?

How severe is CVE-2023-6918?

CVE-2023-6918 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.42% probability of exploitation in the next 30 days.

How do I fix CVE-2023-6918?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-6918?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST