Vulnerability · Published Dec 3, 2025 · Assigned by GitHub_M
CVE-2025-66406Improper Authorization Check for SSH Certificate Revocation
Medium 5.0
In plain English
A medium-severity incorrect authorization in certificates from smallstep. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.0Medium
Exploit odds (30 days)0.2%top 94.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.22 | step-certificates | 0.29.0-r0 | ALPINE-CVE-2025-66406 |
| Alpine:v3.23 | step-certificates | 0.29.0-r0 | ALPINE-CVE-2025-66406 |
| Alpine:v3.24 | step-certificates | 0.29.0-r0 | ALPINE-CVE-2025-66406 |
| Go | github.com/smallstep/certificates | 0.29.0 | GHSA-j7c9-79x7-8hpr |
| Go | github.com/smallstep/certificates | 0.29.0 | GO-2025-4181 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| smallstep | certificates | < 0.29.0 |
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H