CVE-2025-66406

Improper Authorization Check for SSH Certificate Revocation

CVSS 5 MEDIUMEPSS 0.1%CWE-863

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5EPSS 0.1%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

03 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

Step CA is an online certificate authority for secure, automated certificate management for DevOps. Prior to 0.29.0, there is an improper authorization check for SSH certificate revocation. This affects deployments configured with the SSHPOP provisioner. This vulnerability is fixed in 0.29.0.

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

Affected products

smallstep · certificates

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References

https://github.com/smallstep/certificates/security/advisories/GHSA-j7c9-79x7-8hpr