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Security report for tesch-sylt.de

Heinz Tesch GmbH & Co. KG · Energy · Germany

Medium risk. 6 critical or high findings in Security headers, GDPR outside view and 2 other checks.

Security score

50/100

Risk levelMedium

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

Heinz Tesch GmbH & Co. KG is a well-established installer company based on Sylt, Germany, specializing in heating, sanitary, ventilation, and electrical building technology. Founded in 1969, the company serves both private and commercial customers with a strong emphasis on quality, customer service, and modern technology solutions. The website reflects a mature digital presence with comprehensive service descriptions, customer engagement features, and a clear local market focus. Technically, the site is built on TYPO3 CMS, employs modern web technologies, and integrates Google Analytics and YouTube for marketing and engagement. Security posture is solid with HTTPS enforced and cookie consent mechanisms in place, though there is room for improvement in incident response and security policy disclosures. Overall, the website is professional, trustworthy, and compliant with GDPR requirements, supporting the company's reputable market position.

Scanned

NIS2 and GDPR posture

GDPR outside view
68/ 100 · Medium
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

6 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. GDPR outside view

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

    • 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

  3. 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

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

Keep watching tesch-sylt.de

This scan found 27 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.

Daily monitoring

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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Full report

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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
67
Security headers
15
Email security
70
DNS health
60
Network security
20
GDPR outside view
68
Average
50

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 holds a strong local market position on Sylt with recognized expertise, including an award for being among the top 100 bathroom studios in Germany. Its business model focuses on providing installation and consulting services in energy and building technology sectors. The target audience includes private homeowners and commercial clients. The company leverages partnerships, such as with celseo.de, and maintains a moderate-sized workforce. The website's content and structure support lead generation and customer engagement effectively. Growth potential is supported by a clear career section and service expansion into industrial and commercial projects.

Security posture

The website demonstrates a good security maturity level with HTTPS, cookie consent, and no visible vulnerabilities or exposed sensitive data. However, it lacks explicit security policies, incident response contacts, and vulnerability disclosure mechanisms. The use of third-party scripts like Google Analytics and YouTube embeds is managed with consent banners, aligning with GDPR. Recommendations include adding security.txt, enhancing accessibility, and implementing additional security headers like CSP. Overall, the security posture is adequate for the business size and sector but could be improved for higher assurance.

Recommendations

  1. Publish a dedicated security policy and incident response contact information on the website.
  2. Implement a security.txt file to facilitate vulnerability disclosures.
  3. Enhance accessibility features to meet higher standards for inclusivity.
  4. Regularly review and update third-party scripts to mitigate potential vulnerabilities.
  5. Add Content Security Policy (CSP) and other security headers to strengthen defense-in-depth.

Contact details published on the site

Addresses
Legal name
Heinz Tesch GmbH & Co. KG
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Heinz Tesch GmbH & Co. KG
Description
Heinz Tesch GmbH & Co. KG is an installer company specializing in heating, sanitary, ventilation, and electrical building technology on Sylt, Germany. Founded in 1969, it serves private and commercial customers with a focus on quality, customer-centric service, and modern technology.
Key services
Heating installation and renewal, Sanitary installations and bathroom design, Solar technology, Consulting and service for building technology, Industry and commercial project execution
Content quality
excellent
Branding
consistent

Technology

Stack
TYPO3 CMS, JavaScript, CSS, Google Analytics, Google Maps, YouTube embed
Frameworks
TYPO3 CMS
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of consent banner for cookies
  • No visible vulnerable libraries

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Marketing tools
YouTube embeds
Transparency
basic

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Content is rich, well-structured, and professionally presented.
  3. Strong focus on customer service and local market on Sylt.
  4. Good use of structured data and SEO best practices.
  5. Cookie consent and privacy policies are clearly implemented.
  6. No signs of suspicious or malicious activity.
  7. Social media presence limited to Facebook.
  8. WHOIS data supports legitimacy and consistency.
Technical notes

Notes

The website is powered by TYPO3 CMS, a mature and widely used content management system. It uses compressed and merged CSS and JavaScript assets for performance optimization. The site is mobile-optimized with responsive design and lazy loading images. SEO is enhanced via meta tags, Open Graph, and JSON-LD structured data. Hosting is managed by agenturserver with multiple nameservers across domains. Performance is moderate, with potential for improvement in loading speed and accessibility compliance. The technical stack is modern and well-maintained, supporting the business's digital needs effectively.
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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