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Vulnerabilities

Vulnerability · CVE-2023-51384

In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied.

Published Dec 18, 2023 · catalog updated Oct 15, 2026 · In ssh-agent in OpenSSH

Check if you run it

No confirmed exploitation is on record for CVE-2023-51384. EPSS is 0.43%. Act only if a listed version of In ssh-agent in OpenSSH is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In ssh-agent in OpenSSH).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe openbsd/openssh

In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multiple keys.

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 debian/debian linux11.0
  • cpe debian/debian linux12.0
  • cpe openbsd/opensshversion unspecified

How to fix CVE-2023-51384

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-2023-51384. EPSS is 0.43%. Act only if a listed version of In ssh-agent in OpenSSH is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 11.0; debian/debian linux 12.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-284: Improper Access Control. EPSS 0.43%. 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.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 18, 2023 · NIST NVD

    Detected

    In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multiple keys.

  2. Oct 15, 2026 · NIST NVD

    Updated

    In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multiple keys.

Sources

  • CVE.orgVulnerability recordCVE-2023-51384

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-51384

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2023-51384

    In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multipl

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.