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Security report for gelbeseiten.de

Gelbe Seiten · Media · Germany

High risk. 18 critical or high findings in GDPR outside view, Network security and 1 other check.

Security score

49/100

Risk levelHigh

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

Gelbe Seiten is a prominent German business directory offering comprehensive listings of companies, telephone numbers, and addresses across various industries in Germany. The website serves both consumers seeking service providers and businesses aiming to increase visibility through advertising and premium listings. It holds a strong market position supported by multiple awards and a consistent brand presence. Technically, the site employs modern web technologies, including JavaScript frameworks, consent management platforms, and performance optimizations, hosted on reliable infrastructure with Cloudflare DNS. Security posture is robust with HTTPS enforcement and GDPR compliance mechanisms, though there is room for improvement in security headers and incident response transparency. Overall, the site is professional, user-friendly, and trustworthy, with moderate tracking balanced by user consent.

Scanned

NIS2 and GDPR posture

GDPR outside view
40/ 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

18 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

  2. Network security

    Services reachable from the internet are the first thing attackers probe. Anything open that does not need to be should be closed.

    • Critical

      Critical Service Exposed: Telnet

      Port 23 (Telnet) is publicly accessible - Telnet - Unencrypted remote access

      What to do: Immediately restrict access to Telnet using firewall or VPN

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection
    • Critical

      Critical Service Exposed: SMB

      Port 445 (SMB) is publicly accessible - SMB - Windows file sharing, high risk

      What to do: Immediately restrict access to SMB using firewall or VPN

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection
    • Critical

      Critical Service Exposed: MSSQL

      Port 1433 (MSSQL) is publicly accessible - MSSQL - Database server

      What to do: Immediately restrict access to MSSQL using firewall or VPN

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection
    • Critical

      Critical Service Exposed: Oracle

      Port 1521 (Oracle) is publicly accessible - Oracle - Database server

      What to do: Immediately restrict access to Oracle using firewall or VPN

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection

Need hands-on remediation? Email guard@offseq.com

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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
57
Security headers
85
Email security
70
DNS health
65
Network security
0
GDPR outside view
40
Average
53
After the cap
49

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 · found on this site
  • 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

Gelbe Seiten operates as a large-scale media entity focused on the German market, providing essential directory services and advertising solutions. Its business model leverages online listings, premium entries, and integrated services such as Alexa Skills and Apple Messages to enhance user engagement. The company maintains partnerships with related directory services like Das Telefonbuch and Das Örtliche, expanding its ecosystem. The target audience includes general consumers and business owners in Germany. The website's content and structure indicate a mature digital presence with strategic marketing and advertising integrations, positioning Gelbe Seiten as a leader in its sector.

Security posture

The website demonstrates a mature security posture with enforced HTTPS, integration of a consent management platform for GDPR compliance, and absence of exposed sensitive data. However, explicit security headers such as Content-Security-Policy and X-Frame-Options are not evident in the provided data, representing an area for enhancement. No vulnerability disclosures or incident response contacts are published, which could limit responsiveness to security incidents. Tracking and advertising scripts are managed with user consent, aligning with privacy best practices. Overall, the security maturity is good but could benefit from formalized vulnerability disclosure and enhanced header policies.

Recommendations

  1. Implement comprehensive security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to mitigate common web attacks.
  2. Publish a security.txt file to facilitate responsible vulnerability disclosure and improve incident response readiness.
  3. Provide explicit contact information for security incidents or abuse to enhance transparency and trust.
  4. Regularly audit third-party scripts and tracking technologies to ensure compliance with privacy regulations and minimize risk.
  5. Enhance documentation of data retention policies and user privacy practices to strengthen GDPR compliance and user trust.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Gelbe Seiten
Description
Gelbe Seiten is a German business directory providing information on telephone numbers, addresses, fax numbers, and company details categorized by industry sectors.
Key services
Business listings, Telephone and address directory, Advertising solutions, Service offers like Vermittlungsservice, Alexa Skill, Apple Messages integration
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, CSS, HTML5, ConsentManager CMP, Mouseflow, Adition Ads, Cloudflare DNS, Schema.org JSON-LD
Frameworks
ConsentManager, IMA Web Sensor
Performance
fast
Mobile
excellent
Accessibility
good
SEO
excellent

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Consent management platform for GDPR compliance
  • No exposed sensitive data in HTML
  • Secure forms with POST method

Analytics and tracking

Services
Mouseflow, Tealium
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Adition, Google DoubleClick, H5V
Tracking pixels
Facebook Pixel, Mouseflow, Tealium (utag.js)
Marketing tools
ConsentManager CMP, Tealium
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with rich content and no blocking mechanisms.
  2. Strong GDPR compliance with consent management platform integrated.
  3. Multiple awards and trust signals enhance credibility.
  4. No direct contact emails or phone numbers found on the homepage; contact likely via subpages.
  5. Use of modern web technologies and performance optimizations.
  6. Comprehensive SEO and accessibility features present.
  7. No security.txt or explicit incident response contacts found.
  8. Advertising and tracking practices are transparent and consent-based.
Technical notes

Notes

The website is built using modern web standards with extensive use of JavaScript and CSS for a responsive and accessible user experience. It leverages third-party services for consent management, analytics, and advertising, including ConsentManager, Mouseflow, and Adition. Hosting infrastructure includes Cloudflare DNS and IT2Media servers, ensuring reliable performance and security. The site is optimized for SEO with proper meta tags, Open Graph data, and structured JSON-LD markup. Accessibility features such as ARIA labels and keyboard navigation support are present. Performance is optimized with preloading of fonts and scripts, lazy loading of images, and asynchronous script loading. Overall, the technical implementation is robust, scalable, and aligned with best practices.
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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