---
id: CVE-2021-3910
aliases:
  - GHSA-5mxh-2qfv-4g7j
  - GO-2022-0251
title: NUL character in ROA causes OctoRPKI to crash
summary: NUL character in ROA causes OctoRPKI to crash
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: cloudflare
product: github.com/cloudflare/cfrpki
ecosystem: go
affected:
  - github.com/cloudflare/cfrpki < 1.4.0
patched:
  - github.com/cloudflare/cfrpki 1.4.0
published: '2021-11-10'
updated: '2026-07-08'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-5mxh-2qfv-4g7j'
references:
  - url: >-
      https://github.com/cloudflare/cfrpki/security/advisories/GHSA-5mxh-2qfv-4g7j
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-3910'
  - url: >-
      https://github.com/cloudflare/cfrpki/commit/76f0f7a98da001fa04e5bc0407c6702f91096bfa
  - url: 'https://github.com/cloudflare/cfrpki'
  - url: 'https://github.com/cloudflare/cfrpki/releases/tag/v1.4.0'
  - url: 'https://pkg.go.dev/vuln/GO-2022-0251'
  - url: 'https://www.debian.org/security/2022/dsa-5041'
tags:
  - osv
  - go
epss: 0.01297
epssPercentile: 0.69113
ingestedAt: '2026-07-09T18:56:35.941Z'
---

## Overview

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

## Patches

## For more information
If you have any questions or comments about this advisory email us at security@cloudflare.com

## Affected packages

- `github.com/cloudflare/cfrpki < 1.4.0`

## Remediation

Upgrade to a patched release:

- `github.com/cloudflare/cfrpki 1.4.0`