CVE-2021-3909
Infinite open connection causes OctoRPKI to hang forever in github.com/cloudflare/cfrpki
4.4
MEDIUM
CVSS 3.1
EPSS 0.73%
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.
How to fix CVE-2021-3909
To remediate CVE-2021-3909, upgrade the affected package to a fixed version below.
- —upgrade to 1.4.2-1~deb11u1 or later
- —upgrade to 1.5.3-1~deb11u1 or later
- —no fix listed
- —upgrade to 1.4.0 or later
- —upgrade to 1.4.0 or later
Is CVE-2021-3909 being exploited?
Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0, < 1.4.2-1~deb11u1
- from 0, < 1.5.3-1~deb11u1
- from 0
- from 0, < 1.4.0
- from 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 |