What’s Vulnerable › Vulnerabilities

CVE-2021-3908: Infinite certificate chain depth results in OctoRPKI running forever

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-11 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• Cloudflare octorpki: before 1.3.0 — fixed in 1.3.0
• Debian Linux: 11.0

How to fix

Upgrade to a fixed version: Cloudflare octorpki 1.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/cloudflare/cfrpki/security/advisories/GHSA-g5gj-9ggf-9vmq
• https://www.debian.org/security/2022/dsa-5041
• https://github.com/cloudflare/cfrpki/security/advisories/GHSA-g5gj-9ggf-9vmq
• https://www.debian.org/security/2022/dsa-5041

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