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Security report for zueblin.de

Ed. Züblin AG · Other · Germany

Medium risk. 5 critical or high findings in Security headers and SSL/TLS.

Security score

72/100

Risk levelMedium

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

Ed. Züblin AG is a leading German construction and engineering company specializing in high and civil engineering projects. The website reflects a mature enterprise with a comprehensive service portfolio including sustainable building, tunnel construction, and specialized engineering sectors. The company positions itself as the market leader in Germany with a strong focus on quality and innovation. Technically, the website leverages a legacy IBM Domino CMS backend with modern frontend technologies such as Bootstrap and jQuery, supported by privacy-conscious analytics tools like Matomo and a robust cookie consent mechanism via OneTrust. Security posture is solid with HTTPS enforced and no visible vulnerabilities, though improvements in security headers and explicit security policies are recommended. Overall, the site demonstrates good digital maturity and compliance with GDPR, supporting a trustworthy online presence.

Scanned

NIS2 and GDPR posture

GDPR outside view
100/ 100 · Low
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

5 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1
    • High

      Weak SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching zueblin.de

This scan found 21 issues across 5 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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Recommended

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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
52
Security headers
25
Email security
85
DNS health
70
Network security
100
GDPR outside view
100
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

The company operates in the construction and engineering sector with a clear enterprise-scale business model. Its market position as the number one in German high and civil engineering is supported by a broad range of services and regional subsidiaries. The website's structure and domain redirects indicate a well-organized partnership and subsidiary ecosystem. The use of AWS DNS and professional branding further reinforce business credibility. The absence of direct contact emails or phone numbers on the main page suggests a controlled communication strategy, likely centralized through contact forms or legal imprint pages. The company targets expert and professional audiences, emphasizing quality and sustainability in construction projects.

Security posture

The website maintains a good security posture with HTTPS enforced and use of privacy-respecting analytics. Cookie consent is managed via OneTrust, indicating compliance with privacy regulations. However, the absence of explicit security headers such as Content-Security-Policy and X-Frame-Options suggests room for enhancement. No incident response or vulnerability disclosure information is publicly available, which could be improved to increase transparency and readiness. No exposed sensitive data or vulnerable libraries were detected in the analyzed content. Overall, the security maturity is solid but could benefit from formalized policies and additional technical controls.

Recommendations

  1. Implement comprehensive security headers including CSP, X-Frame-Options, and X-Content-Type-Options to mitigate common web attacks.
  2. Publish a dedicated security policy and incident response page to improve transparency and preparedness.
  3. Add a security.txt file to facilitate responsible vulnerability disclosure.
  4. Regularly update all third-party libraries and frameworks to their latest secure versions.
  5. Enhance accessibility features to comply with modern standards and improve user experience for all users.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Ed. Züblin AG
Description
Wir setzen Maßstäbe! Dieser Anspruch hat uns zur Nummer eins im deutschen Hoch- und Ingenieurbau gemacht. Unseren Kunden bieten wir ein umfassendes Leistungsspektrum für Bauvorhaben jeder Art und Größe.
Key services
Hoch- und Ingenieurbau, PPP (public private partnership), Partnering, Schlüsselfertigbau, Nachhaltiges Bauen, Tunnelbau, Umwelttechnik, Spezialtiefbau, Stahlbau, Lärmschutzsysteme
Content quality
good
Branding
consistent

Technology

Stack
jQuery 3.3.1, Bootstrap 3.3.5, FancyBox 3.0.47, FontAwesome 5.0.9, Matomo Tag Manager, OneTrust Cookie Consent, etracker analytics
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Cookie consent with OneTrust
  • No exposed sensitive data in HTML
  • Use of privacy-focused analytics (Matomo)

Analytics and tracking

Services
Matomo, etracker
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
etracker, Matomo
Marketing tools
OneTrust Cookie Consent
Transparency
good

Site quality

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

Key observations

  1. Website uses IBM Domino backend (.nsf URLs) indicating enterprise-grade CMS
  2. Comprehensive cookie consent and privacy compliance mechanisms implemented
  3. Multiple domain redirects consolidate traffic to main domain zueblin.de
  4. No direct contact emails or phone numbers explicitly found in HTML content
  5. Strong branding with consistent logo usage
  6. Use of privacy-respecting analytics (Matomo) alongside commercial etracker
  7. No visible security.txt or explicit security policy pages
  8. No exposed sensitive data or obvious vulnerabilities in HTML content
Technical notes

Notes

The website uses a combination of legacy backend technology (IBM Domino) and modern frontend libraries such as Bootstrap and jQuery. Hosting is managed via AWS infrastructure, ensuring scalability and reliability. Performance is moderate with room for optimization, especially considering the use of multiple external scripts and analytics tools. SEO is well addressed with comprehensive meta tags and Open Graph data. Mobile optimization is good, supported by responsive design frameworks. Accessibility is basic and could be improved. The technical stack reflects a mature enterprise environment with some legacy components that may require modernization to maintain agility and security.
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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