ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2023-6918

A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends.

Published Dec 19, 2023 · catalog updated Nov 6, 2026 · A flaw was found

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2023-6918. EPSS is 1.41%. Act only if a listed version of A flaw was found is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A flaw was found).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.41%
Remediation
Version ranges on file
Affected products
cpe fedoraproject/fedora · cpe libssh/libssh · cpe redhat/enterprise linux

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe fedoraproject/fedora38
  • cpe fedoraproject/fedora39
  • cpe libssh/libssh< 0.10.6
  • cpe libssh/libssh< 0.9.8
  • cpe redhat/enterprise linux8.0
  • cpe redhat/enterprise linux9.0

How to fix CVE-2023-6918

  • Upgrade

    CVE-2023-6918 lists a fix boundary at 0.10.6. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 0.10.6

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2023-6918. EPSS is 1.41%. Act only if a listed version of A flaw was found is installed.

Which versions are affected?

Compare what you have installed with redhat/enterprise linux 8.0; redhat/enterprise linux 9.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-252: Unchecked Return Value. EPSS 1.41%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 19, 2023 · NIST NVD

    Detected

    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/in

  2. Nov 6, 2026 · NIST NVD

    Updated

    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/in

Sources

  • CVE.orgVulnerability recordCVE-2023-6918

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2023-6918

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • NIST NVDNov 6, 2026
  • CVE.orgNov 6, 2026