Ed. Züblin AG · Transportation · Germany
Medium risk. 5 critical or high findings in Security headers and SSL/TLS.
Ed. Züblin AG is a leading German construction company specializing in high and civil engineering projects, including tunnel construction, bridge building, and infrastructure development. The company holds a strong market position as the number one in German high and civil engineering construction, offering a comprehensive range of services to its professional and expert target audience. The website reflects a mature digital presence with a professional design, clear navigation, and consistent branding aligned with its enterprise status and industry sector. Technically, the site is built on an IBM Domino backend with modern frontend technologies such as Bootstrap and jQuery, hosted on AWS infrastructure, and integrates privacy-compliant analytics tools like Matomo and eTracker with OneTrust cookie consent management. Security posture is solid with HTTPS enforcement and cookie consent mechanisms, though there is room for improvement in security headers and explicit incident response information. Overall, the site demonstrates high professionalism, GDPR compliance, and trustworthy business credibility, making it a reliable digital asset for the company.
Scanned
NIS2 Art. 21(2)
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.
5 findings rated critical or high. Fix these first.
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.
Forces HTTPS connections
What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"
Prevents clickjacking attacks
What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"
Controls resources the browser is allowed to load
What to do: Implement a Content-Security-Policy appropriate for your application
TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.
Server supports weak protocols: TLSv1.1
What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions
SSL certificate uses 256-bit key, which is considered weak
What to do: Use at least 2048-bit RSA or 256-bit ECC key
Need hands-on remediation? Email guard@offseq.com
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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Each check with its score, findings and the evidence it collected.
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
Not counted
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.
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
Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.
Leaked records that mention zueblin-tunnelbau.de, from OffSeq Breach.
No leaked records found
Breach holds no records for zueblin-tunnelbau.de right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.
Domains that imitate zueblin-tunnelbau.de and could be used for phishing or spoofed email, tracked in OffSeq Breach.
Last checked 2026-06-20
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Lookalike data refreshes continuously. Monitoring on Breach alerts you when a variant is registered, gains a mail server or starts serving HTTPS.
Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.
Automated reading of the public site. Ratings are indicative.
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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