Skip to main content

Security report for zueblin.eu

Ed. Züblin AG · Manufacturing · 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 company specializing in high-rise and civil engineering projects. Positioned as the number one in the German market, it offers a broad range of services including tunnel construction, steel construction, and environmental technology. The website reflects a mature enterprise with consistent branding and a comprehensive navigation structure representing various regional and specialized divisions. Technically, the site employs a modern tech stack with Bootstrap, jQuery, and FontAwesome, hosted on AWS infrastructure, and uses IBM Domino CMS. Privacy compliance is robust with a clear GDPR-compliant privacy policy and cookie consent mechanism. Security posture is good with HTTPS enforced and reputable analytics tools integrated with consent management. No critical vulnerabilities or suspicious indicators were found, though some security headers could be improved. Overall, the site demonstrates a professional and trustworthy digital presence aligned with its enterprise status.

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.eu

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.

Daily monitoring

Recommended

€25per month

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

Email alerts on material changes and an exportable JSON history of every change.

Billed monthly to your card. Cancel anytime. See sample alerts.

Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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 manufacturing and transportation sectors with a focus on construction and engineering. Its business model centers on delivering turnkey construction solutions and specialized engineering services. The website's structure reveals a decentralized organization with multiple regional subsidiaries and specialized divisions, indicating a broad operational footprint. The parent company is STRABAG SE, a major European construction group. The site’s content targets professionals and experts, emphasizing quality, sustainability, and innovation. The presence of multiple subdomains and redirects suggests a well-integrated digital ecosystem supporting various business units. The company leverages strategic partnerships for content delivery and analytics, enhancing operational efficiency and market reach.

Security posture

The website enforces HTTPS and integrates cookie consent compliant with GDPR, reflecting a strong privacy and security culture. Use of reputable analytics platforms like etracker and Matomo with consent management indicates responsible data handling. However, explicit security headers such as Content-Security-Policy and X-Frame-Options are not visibly implemented, representing an area for improvement. No exposed sensitive data or vulnerable libraries were detected in the HTML content. The absence of a security.txt or vulnerability disclosure page suggests limited public incident response transparency. Overall, the security posture is solid for an enterprise website but could benefit from enhanced header policies and explicit incident response documentation.

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 policy or security.txt file to facilitate responsible vulnerability disclosure and improve transparency.
  3. Regularly audit and update third-party libraries and scripts to ensure no vulnerabilities are present.
  4. Enhance accessibility features to improve compliance and user experience for all users.
  5. Consider adding visible contact information for security and general inquiries to improve trust and communication.
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
Hochbau, Ingenieurbau, Tunnelbau, Spezialtiefbau, Stahlbau, Brückenbau, Umwelttechnik, Bauforschung, Schlüsselfertigbau, Nachhaltiges Bauen
Content quality
good
Branding
consistent

Technology

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

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Cookie consent with opt-in/out
  • No exposed sensitive data in HTML
  • Use of reputable analytics with consent management

Analytics and tracking

Services
etracker, Matomo
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 HTTPS with valid SSL
  2. Comprehensive cookie consent mechanism implemented
  3. No visible contact emails or phone numbers on main page
  4. Corporate branding consistent with parent company STRABAG SE
  5. Multiple redirects from related domains to main domain
  6. Use of IBM Domino CMS inferred from URL patterns
  7. Analytics and tracking scripts respect user consent
  8. No visible security.txt or explicit vulnerability disclosure page
  9. No terms of service page detected
  10. Navigation structure is complex but well organized
Technical notes

Notes

The website uses a combination of modern front-end technologies including Bootstrap 3.3.5, jQuery 3.3.1, and FontAwesome 5.0.9, ensuring responsive design and rich UI components. Hosting is on AWS infrastructure, inferred from DNS servers, providing scalability and reliability. The CMS appears to be IBM Domino, indicated by URL patterns with .nsf and Openagent, which is less common but suitable for enterprise content management. Analytics are handled via etracker and Matomo, integrated with OneTrust for cookie consent, demonstrating compliance with privacy regulations. Performance is moderate, with room for optimization in script loading and caching. The site is mobile optimized with good navigation clarity but could improve accessibility standards. Overall, the technical infrastructure supports a stable and professional web presence aligned with enterprise requirements.
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

Reviews of this site

Share your experience with zueblin.eu. Every review is verified by email and published after moderation.

Overall rating
Select a rating
4000 characters remaining

We’ll email you to confirm your review and keep your details private.

Community rating

No published reviews yet. Be the first to review zueblin.eu.

Feedback on this report

Rate this report, add an optional comment, and tell us if you want a security specialist to follow up.

Overall report quality
Select a rating
2000 characters remaining

We only use your feedback to improve Guard reports. Contact details are never shared.