CVE-2021-3907

Name: CVE-2021-3907
Creator: NVD / NIST
Published: 2021-11-11T22:15:07.82+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 4.06%

Last modified Jun 17, 2026

CVE-2021-3907 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. OctoRPKI does not escape a URI with a filename containing "..", this allows a repository to create a file, (ex. rsync://example.org/repo/../../etc/cron.daily/evil.roa), which would then be written to disk outside the base cache folder. EPSS estimates a 4.06% chance of exploitation in the next 30 days.

Description

OctoRPKI does not escape a URI with a filename containing "..", this allows a repository to create a file, (ex. rsync://example.org/repo/../../etc/cron.daily/evil.roa), which would then be written to disk outside the base cache folder. This could allow for remote code execution on the host machine OctoRPKI is running on.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

4.06%

89.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cloudflare	Octorpki	< 1.3.0
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://github.com/cloudflare/cfrpki/security/advisories/GHSA-3jhm-87m6-x959Third Party Advisory
https://github.com/cloudflare/cfrpki/security/advisories/GHSA-cqh2-vc2f-q4fhThird Party Advisory
https://www.debian.org/security/2021/dsa-5033Third Party Advisory
https://www.debian.org/security/2022/dsa-5041Third Party Advisory
https://github.com/cloudflare/cfrpki/security/advisories/GHSA-3jhm-87m6-x959Third Party Advisory
https://github.com/cloudflare/cfrpki/security/advisories/GHSA-cqh2-vc2f-q4fhThird Party Advisory
https://www.debian.org/security/2021/dsa-5033Third Party Advisory
https://www.debian.org/security/2022/dsa-5041Third Party Advisory

Timeline

Published: Nov 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3907?

How severe is CVE-2021-3907?

CVE-2021-3907 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.06% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3907?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3907?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST