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Vulnerabilities

Vulnerability · CVE-2024-6387

A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd).

Published Jul 1, 2024 · catalog updated Oct 15, 2026 · OpenSSH SSHD

Patch now

CVE-2024-6387 is in the CISA known-exploited catalog. Confirm OpenSSH SSHD against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
High8.1
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
99.51%
Remediation
Remediation guidance
Affected products
cpe almalinux/almalinux · cpe arista/eos · cpe canonical/ubuntu linux · cpe netapp/a1k firmware · cpe netapp/a70 firmware · cpe sonicwall/sma 6200 firmware

A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period. Initial-access exploit intelligence.

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 almalinux/almalinux9.0
  • cpe arista/eosversion unspecified
  • cpe canonical/ubuntu linux23.10
  • cpe canonical/ubuntu linux24.04
  • cpe netapp/a1k firmwareversion unspecified
  • cpe netapp/a70 firmwareversion unspecified
  • cpe sonicwall/sma 6200 firmwareversion unspecified
  • cpe sonicwall/sma 6210 firmwareversion unspecified
  • cpe sonicwall/sma 7200 firmwareversion unspecified
  • cpe sonicwall/sma 7210 firmwareversion unspecified
  • cpe sonicwall/sma 8200v firmwareversion unspecified
  • cpe sonicwall/sra ex 7000 firmwareversion unspecified
  • vendor OpenSSH SSHDversion unspecified

How to fix CVE-2024-6387

What to do

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

Should you patch?

CVE-2024-6387 is in the CISA known-exploited catalog. Confirm OpenSSH SSHD against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with canonical/ubuntu linux 23.10; canonical/ubuntu linux 24.04. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-362: Race Condition; CWE-364. EPSS 99.51%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. 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. Jul 1, 2024 · NIST NVD

    Detected

    A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.

  2. Jul 17, 2024 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  3. Sep 1, 2026 · NIST NVD

    Updated

    A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.

  4. Oct 15, 2026 · NIST NVD

    Updated

    A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.

Sources

  • CERT-FRGovernment advisoryCVE-2024-6387

    Le 1 juillet 2024, OpenSSH a publié un avis de sécurité concernant la vulnérabilité critique CVE-2024-6387. Cette vulnérabilité permet à un attaquant non authentifié d'exécuter du code arbitraire à distance avec les privilèges *root*. L'éditeur précise que les versions 8.5p1 à 9.

    cert.ssi.gouv.fr
  • CVE.orgVulnerability recordCVE-2024-6387

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2024-6387

    30-day exploitation probability 99.5%

    first.org
  • Exploit DatabasePublic exploit reference52269

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • NIST NVDVulnerability recordCVE-2024-6387

    A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time pe

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2024-6387

    A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time pe

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.