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CVE-2021-3910

25
FAUCET Score

CVE-2021-3910 describes a high-severity vulnerability in OctoRPKI and Debian Linux where the software crashes upon encountering a repository returning an invalid Route Origin Authorization (ROA) containing a null character. This unauthenticated denial-of-service vulnerability, with a CVSS score of 7.5, can be triggered remotely with low attack complexity, leading to high availability impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.4.0CPE matchmatch criteria
cpe:2.3:a:cloudflare:octorpki:*:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.4MEDIUM

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
0.7
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.26%
Probability of exploitation in next 30 days
EPSS Percentile
66.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0126 is in the 46th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

gopatch availablevia ghsa
Product: github.com/cloudflare/cfrpkiFixed in: 1.4.0

Vendor Advisories (1)

goGHSA-5mxh-2qfv-4g7jhigh

NUL character in ROA causes OctoRPKI to crash

Nov 10, 2021

References

github.com / cloudflare/cfrpki/security/advisories/GHSA-5mxh-2qfv-4g7j
Third Party Advisory
debian.org / security/2022/dsa-5041
Third Party Advisory