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CVE-2021-3909
Infinite open connection causes OctoRPKI to hang forever
Medium4.4EPSS 1.6%
- Published
- Updated
- Reserved
- Assigned by
- cloudflare
Description
OctoRPKI does not limit the length of a connection, allowing for a slowloris DOS attack to take place which makes OctoRPKI wait forever. Specifically, the repository that OctoRPKI sends HTTP requests to will keep the connection open for a day before a response is returned, but does keep drip feeding new bytes to keep the connection alive.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| cloudflareCNA (assigner) | 3.1 | Medium4.4 | CVSS:3.1/AV:N/AC:H/PR:H/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)
- 1.6% · top 24% 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 4.4.
Weakness
Affected products
- affected unspecified – < 1.4.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/cloudflare/cfrpkiGHSA-8cvr-4rrf-f244 (opens in a new tab)
What to do
Solution: Upgrade to 1.4
References (3)
- https://github.com/cloudflare/cfrpki/security/advisories/GHSA-8cvr-4rrf-f244 (opens in a new tab)x_refsource_MISCx_transferred
- DSA-5033 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_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-8cvr-4rrf-f244 (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-2021-3909)Record last updated .