{
  "slug": "x41-d-sec",
  "category": "security-audit-firms",
  "name": "X41 D-Sec",
  "description": "German security firm in Aachen that performs source code audits, penetration tests, fuzzing and red teaming, with many published audits of open-source projects.",
  "website": "https://x41-dsec.de",
  "license": null,
  "platforms": [],
  "jurisdiction": {
    "code": "DE",
    "name": "Germany",
    "eyes": "Fourteen Eyes",
    "eu": true,
    "gdpr": true,
    "cloud_act": null
  },
  "pick": false,
  "pick_reason": null,
  "disclosure": null,
  "grade": "A",
  "score": 100,
  "coverage": 100,
  "summary": "X41 D-Sec scores 100 out of 100 (grade A) on the security audit firms criteria. It meets 4 of 4 criteria: publishes full reports, audits open-source projects, public research and no trackers on website. It is based in Germany: Fourteen Eyes member; EU member (GDPR). Automated tests: SSL Labs grade A+ and Mozilla HTTP Observatory grade B.",
  "url": "https://privacyratings.com/security-audit-firms/x41-d-sec/",
  "markdown": "https://privacyratings.com/security-audit-firms/x41-d-sec/index.md",
  "answers": {
    "public_reports": {
      "title": "Publishes full reports",
      "weight": 3,
      "answer": "yes",
      "evidence": "https://x41-dsec.de/references/",
      "note": "The references page links around thirty full public audit reports."
    },
    "open_source_work": {
      "title": "Audits open-source projects",
      "weight": 2,
      "answer": "yes",
      "evidence": "https://x41-dsec.de/static/reports/X41-OSTIF-Hickory-DNS-2025-Audit-Report-Public.pdf",
      "note": "Regularly audits open-source projects, many for OSTIF, including Git, Envoy, CRI-O, Hickory DNS and BIND 9."
    },
    "public_research": {
      "title": "Public research",
      "weight": 1,
      "answer": "yes",
      "evidence": "https://x41-dsec.de/news/lab/",
      "note": "Publishes security advisories and research through its lab and blog."
    },
    "no_trackers": {
      "title": "No trackers on website",
      "weight": 1,
      "answer": "yes",
      "evidence": "https://x41-dsec.de/privacy/",
      "note": "The home page loads no third-party scripts, and the privacy policy describes only server log files, with no analytics services."
    }
  },
  "tests": {
    "ssllabs": "A+",
    "observatory": "B",
    "internetnl_web": null,
    "internetnl_mail": null,
    "trackers": [],
    "tested_at": "2026-10-01T07:07:14.607Z"
  },
  "last_modified": "2026-10-01T07:44:20Z"
}