CVE-2021-3909
MEDIUM4.4EPSS 0.73%Infinite open connection causes OctoRPKI to hang forever in github.com/cloudflare/cfrpki
Published: 11/10/2021Modified: 4/28/2026
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.
Affected packages (5)
- Debian/cfrpkifrom 0, < 1.4.2-1~deb11u1
- Debian/fort-validatorfrom 0, < 1.5.3-1~deb11u1
- Debian/rpki-clientfrom 0
- Go/github.com/cloudflare/cfrpkifrom 0, < 1.4.0
- Go/github.com/cloudflare/cfrpkifrom 0, < 1.4.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.4 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-3909
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-3909
- PATCHhttps://github.com/cloudflare/cfrpki
- WEBhttps://github.com/cloudflare/cfrpki/releases/tag/v1.4.0
- WEBhttps://github.com/cloudflare/cfrpki/security/advisories/GHSA-8cvr-4rrf-f244
- WEBhttps://www.debian.org/security/2021/dsa-5033
- WEBhttps://www.debian.org/security/2022/dsa-5041