CVE-2021-3909

low-risk
Published 2021-11-11

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.

Do I need to act?

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0.73% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.4/10 Medium
NETWORK / HIGH complexity

Affected Products (2)

Octorpki

Affected Vendors

Debian Cloudflare

References (6)

Third Party Advisory https://github.com/cloudflare/cfrpki/security/advisories/GHSA-8cvr-4rrf-f244
Third Party Advisory https://www.debian.org/security/2021/dsa-5033
Third Party Advisory https://www.debian.org/security/2022/dsa-5041
Third Party Advisory https://github.com/cloudflare/cfrpki/security/advisories/GHSA-8cvr-4rrf-f244
Third Party Advisory https://www.debian.org/security/2021/dsa-5033
Third Party Advisory https://www.debian.org/security/2022/dsa-5041
23
/ 100
low-risk
Severity 14/34 · Moderate
Exploitability 2/34 · Minimal
Exposure 7/34 · Low