CVE-2023-6918

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

1.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2023-12-19 00:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-11-06 14:17 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.4% in the next 30 days (EPSS).
• Severity: 3.7 LOW (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-12-19 00:15 UTC

Last modified

2026-11-06 14:17 UTC

Exploit probability

1.4% · EPSS, next 30 days

Weakness

CWE-252

Record status

Modified

Affected

• Libssh < 0.9.8
• Libssh < 0.10.6
• Fedoraproject Fedora 38
• Fedoraproject Fedora 39
• Redhat Enterprise Linux 8.0
• Redhat Enterprise Linux 9.0

Attack profile CVSS 3.1 · 3.7

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-6918.md and follow it. Check whether this project is affected by CVE-2023-6918. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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