Vulnerability Details : 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 category: Denial of service
Products affected by CVE-2021-3909
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
- cpe:2.3:a:cloudflare:octorpki:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-3909
0.44%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 74 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-3909
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
4.4
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H |
0.7
|
3.6
|
Cloudflare, Inc. | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-3909
-
The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.Assigned by:
- cna@cloudflare.com (Secondary)
- nvd@nist.gov (Primary)
References for CVE-2021-3909
-
https://www.debian.org/security/2022/dsa-5041
Debian -- Security Information -- DSA-5041-1 cfrpkiThird Party Advisory
-
https://github.com/cloudflare/cfrpki/security/advisories/GHSA-8cvr-4rrf-f244
Infinite open connection causes OctoRPKI to hang forever · Advisory · cloudflare/cfrpki · GitHubThird Party Advisory
-
https://www.debian.org/security/2021/dsa-5033
Debian -- Security Information -- DSA-5033-1 fort-validatorThird Party Advisory
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