Is CVE-2023-6918 in the CISA KEV catalog?

No. CVE-2023-6918 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-6918?

CVE-2023-6918 has a CVSS v3 base score of 3.7 (LOW).

What is the EPSS score for CVE-2023-6918?

CVE-2023-6918 has an EPSS score of 1.42% (70th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-6918?

Upgrade libssh on debian 11 to 0.9.8-0+deb11u1 or later. Fixes are available for 14 affected products.

CVE & CISA-KEV Catalog

CVE-2023-6918

LOW

3.7

CVSS v3

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.

CWE-252

How to fix

Remediation Available

libsshDebian

Fixed in:0.9.8-0+deb11u1CVE-2023-6918

Fixed in:0.10.6-0+deb12u1CVE-2023-6918

Fixed in:0.10.6-1CVE-2023-6918

libsshRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libsshRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-configRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-configRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-debuginfoRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-debuginfoRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-debugsourceRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-debugsourceRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-develRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-develRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libsshUbuntu

Fixed in:0.6.3-4.3ubuntu0.6+esm1USN-6592-2

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3USN-6592-2

Fixed in:0.9.3-2ubuntu2.5USN-6592-1

Fixed in:0.9.6-2ubuntu0.22.04.3USN-6592-1

Fixed in:0.10.4-2ubuntu0.3USN-6592-1

Fixed in:0.10.5-3ubuntu1.2USN-6592-1

libssh-4Ubuntu

Fixed in:0.6.3-4.3ubuntu0.6+esm1USN-6592-2

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3USN-6592-2

Fixed in:0.9.3-2ubuntu2.5USN-6592-1

Fixed in:0.9.6-2ubuntu0.22.04.3USN-6592-1

Fixed in:0.10.4-2ubuntu0.3USN-6592-1

Fixed in:0.10.5-3ubuntu1.2USN-6592-1

libssh-gcrypt-4Ubuntu

Fixed in:0.6.3-4.3ubuntu0.6+esm1USN-6592-2

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3USN-6592-2

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

1.42%probability of exploitation in 30 days

70thpercentile

Moderate risk: more likely to be exploited than 70% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory1

bugzilla.redhat.com

Release Notes1

libssh.org

Other references5

Embed a live status badge for CVE-2023-6918

Markdown

[![CVE-2023-6918](https://tridentstack.com/cve/badge/CVE-2023-6918.svg)](https://tridentstack.com/cve/CVE-2023-6918)

HTML

<a href="https://tridentstack.com/cve/CVE-2023-6918"><img src="https://tridentstack.com/cve/badge/CVE-2023-6918.svg" alt="CVE-2023-6918"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-02-15.