Resource exhaustion in Cloudflare Octorpki
CVE-2021-3909
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.015 (71.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Cloudflare Octorpki — versions unspecified
- Debian Debian_linux — versions 11.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cna@cloudflare.com (Third Party Advisory, x_refsource_MISC)
- cna@cloudflare.com (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- cna@cloudflare.com (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
Frequently asked questions
- What is CVE-2021-3909?
- CVE-2021-3909 is a medium-severity vulnerability in Cloudflare Octorpki, classified under Uncontrolled Resource Consumption. CVSS score: 4.4/10. Published 2021-11-11.
- How severe is CVE-2021-3909?
- Medium severity. CVSS v3 base score is 4.4 out of 10.
- Is CVE-2021-3909 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.