Back
CVE-2021-3908
Infinite certificate chain depth results in OctoRPKI running forever
Medium5.9EPSS 0.73%
- Published
- Updated
- Reserved
- Assigned by
- cloudflare
Description
OctoRPKI does not limit the depth of a certificate chain, allowing for a CA to create children in an ad-hoc fashion, thereby making tree traversal never end.
Timeline
ID reserved
By cloudflare
- 16 days later
· 16 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| cloudflareCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.73% · top 45% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
- affected unspecified – < 1.4.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/cloudflare/cfrpkiGHSA-g5gj-9ggf-9vmq (opens in a new tab)
What to do
Solution: Upgrade to 1.4
References (2)
- https://github.com/cloudflare/cfrpki/security/advisories/GHSA-g5gj-9ggf-9vmq (opens in a new tab)x_refsource_MISCx_transferred
- DSA-5041 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-g5gj-9ggf-9vmq (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-3908)Record last updated .