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Security report for circl.lu

Computer Incident Response Center Luxembourg (CIRCL) · Government · Luxembourg

Medium risk. 3 critical or high findings in GDPR outside view.

Security score

72/100

Risk levelMedium

0–100, higher is better. How it is calculated

The Computer Incident Response Center Luxembourg (CIRCL) is a government-driven cybersecurity entity serving as the national CERT/CSIRT for Luxembourg's private sector, communes, and non-governmental organizations. CIRCL provides a broad range of cybersecurity services including threat intelligence sharing via the MISP platform, dynamic malware analysis, passive DNS historical data, and document sanitization from untrusted USB devices. The organization maintains a strong market position as a trusted government-affiliated cybersecurity resource with a history dating back to 2008 and operates under the Luxembourg House of Cybersecurity (LHC). The website reflects a professional and authoritative presence with comprehensive security advisories and publications.

Scanned

NIS2 and GDPR posture

GDPR outside view
28/ 100 · High
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

3 findings rated critical or high. Fix these first.

  1. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

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Keep watching circl.lu

This scan found 20 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

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  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
90
Security headers
75
Email security
60
DNS health
80
Network security
100
GDPR outside view
28
Average
72

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

CIRCL operates primarily in the government and technology sectors, targeting private and public entities within Luxembourg. Its business model focuses on providing incident response, threat intelligence sharing, and cybersecurity services to enhance national cyber resilience. The organization benefits from strong trust indicators including government backing, active publication of vulnerability disclosures, and integration with recognized cybersecurity frameworks. CIRCL's partnership ecosystem includes the Luxembourg House of Cybersecurity and related national initiatives. The website's content and service offerings indicate a mature and well-established operation with a clear focus on cybersecurity community support and collaboration.

Security posture

CIRCL demonstrates a mature security posture with enforced HTTPS, PGP signatures for content integrity, and a clear focus on vulnerability disclosure and incident response. The website does not expose sensitive data and maintains a TLP:CLEAR classification for its content, promoting transparency. However, there is room for improvement in publishing explicit security policies, incident response contact channels, and implementing comprehensive security headers. No critical vulnerabilities or security issues were detected in the website content. The absence of cookie consent mechanisms and detailed privacy compliance documentation suggests minor compliance gaps that could be addressed to enhance trust and regulatory adherence.

Recommendations

  1. Implement and display a cookie policy with a user consent mechanism to comply with privacy regulations.
  2. Publish a dedicated security policy and incident response contact information to improve transparency and trust.
  3. Add security headers such as Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options to enhance website security.
  4. Consider publishing a security.txt file to facilitate coordinated vulnerability disclosure and improve communication with security researchers.
  5. Enhance accessibility features to improve usability for all users and comply with accessibility standards.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Computer Incident Response Center Luxembourg (CIRCL)
Description
The Computer Incident Response Center Luxembourg (CIRCL) is a government-driven initiative designed to gather, review, report and respond to computer security threats and incidents. CIRCL is the CERT for the private sector, communes and non-governmental entities in Luxembourg.
Key services
MISP Threat Intelligence Sharing Platform, Dynamic Malware Analysis (DMA), Clean documents from untrusted USB keys, Passive DNS database, Pandora Document and File Analysis, Hash lookup public API
Content quality
excellent
Branding
consistent

Technology

Stack
HTML5, CSS3, Font Awesome, Responsive design
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced (implied by URL)
  • PGP signature for page verification
  • TLP:CLEAR content classification
  • No exposed sensitive data in HTML

Analytics and tracking

Tracking level
minimal
Privacy practices
good

Advertising

Transparency
poor

Site quality

Design
good
User experience
good
Content relevance
excellent
Navigation
good
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Content is rich with detailed security advisories and publications.
  3. Strong government affiliation and trust signals.
  4. No visible privacy or cookie consent banners.
  5. No direct email addresses or phone numbers found in HTML content.
  6. Social media presence on Twitter, Mastodon, and GitHub.
  7. Use of PGP signatures for page integrity verification.
  8. No advertising or tracking scripts detected.
Technical notes

Notes

The website uses a clean, standards-compliant HTML5 and CSS3 codebase with Font Awesome icons and responsive design elements. Hosting is managed via EuroDNS nameservers, indicating a professional domain management setup. The site lacks a known CMS, suggesting a custom or lightweight platform. Performance is moderate with good mobile optimization and basic accessibility. SEO is supported by proper meta tags and structured navigation. No analytics or tracking scripts were detected, indicating a privacy-conscious implementation. Technical risks are minimal, but the absence of advanced security headers and cookie consent mechanisms represent areas for modernization and compliance improvement.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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