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Security report for stiebel-eltron.com

STIEBEL ELTRON GmbH & Co. KG · Energy · Germany

Medium risk. 4 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

66/100

Risk levelMedium

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

STIEBEL ELTRON GmbH & Co. KG is a large enterprise operating internationally in the energy sector, specializing in efficient solutions for hot water, room heating, air conditioning, and renewable energy technologies such as heat pumps and ventilation systems. The company maintains a professional and comprehensive website that targets both general consumers and professionals in building services. Their market position is strong with subsidiaries and agencies in over 120 countries, reflecting a broad global footprint. Technically, the website is built on a modern stack including RequireJS, Modernizr, and Piwik PRO analytics, likely managed via Adobe Experience Manager CMS. The site is mobile optimized with good SEO and accessibility features, though some improvements in security headers could be made. Performance is moderate, with a well-structured navigation and rich content. From a security perspective, the site enforces HTTPS and implements cookie consent mechanisms aligned with GDPR compliance. However, the absence of WHOIS registration data raises concerns about domain transparency and trustworthiness. No critical vulnerabilities or exposed sensitive data were detected, but the lack of explicit security headers and incident response information suggests room for enhancement. Overall, the website presents a low risk with strong business credibility and privacy compliance, but domain registration opacity slightly reduces trust. Strategic recommendations include improving domain WHOIS transparency, adding security headers, and publishing a vulnerability disclosure policy to strengthen security posture and stakeholder trust.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 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

4 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

  2. GDPR outside view

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

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • 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. Network security

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

    • High

      High-Risk Service Exposed: FTP

      Port 21 (FTP) is publicly accessible - FTP - Often unencrypted file transfer

      What to do: Consider restricting access to FTP or implementing strong authentication

      • 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

Keep watching stiebel-eltron.com

This scan found 16 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.

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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
85
Security headers
70
Email security
85
DNS health
85
Network security
20
GDPR outside view
53
Average
66

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

STIEBEL ELTRON operates in the energy sector with a focus on sustainable building services and renewable energy solutions. Their business model revolves around manufacturing and distributing heating, ventilation, and hot water products globally. The company targets both end consumers and professional markets such as construction and engineering. Their extensive international presence and product range indicate a mature and diversified revenue stream. The website reflects a well-established brand with consistent messaging and a comprehensive service offering. Partnerships and subsidiaries are implied but not explicitly listed. The company leverages digital tools like webinars and online configurators to engage professionals, indicating a strategic focus on customer support and education.

Security posture

The website demonstrates a moderate to good security maturity level with HTTPS enforced and GDPR-compliant cookie consent mechanisms. No critical security headers were detected, which is a gap in best practices. The absence of a published incident response contact or vulnerability disclosure policy limits transparency and readiness perception. No exposed credentials or vulnerabilities were found in the HTML content. The use of Piwik PRO analytics suggests a privacy-conscious approach. Overall, the security posture is adequate for a corporate website but could be improved by implementing additional HTTP security headers, publishing security policies, and enhancing incident response visibility.

Recommendations

  1. Publish complete WHOIS registration data or ensure domain registration transparency to improve trust.
  2. Implement and configure HTTP security headers such as Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options.
  3. Publish a vulnerability disclosure policy or security.txt file to facilitate responsible reporting and improve security culture.
  4. Add explicit incident response contact information or security policy page to enhance transparency and preparedness.
  5. Regularly audit and update third-party libraries and analytics tools to mitigate potential vulnerabilities.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
STIEBEL ELTRON GmbH & Co. KG
Description
STIEBEL ELTRON has efficient solutions for hot water, room heating, air conditioning and renewables (heat pumps and ventilation).
Key services
Heat pumps, Ventilation systems, Domestic hot water solutions, Room heating, Water filters, Engineering and planning services
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, RequireJS, Modernizr, Piwik PRO analytics, Greensock TweenMax, Swiper.js
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enabled
  • Cookie consent mechanism
  • No exposed sensitive data in HTML
  • Secure forms with no visible vulnerabilities

Analytics and tracking

Services
Piwik PRO
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Piwik PRO
Marketing tools
Piwik PRO
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 professional design.
  2. No WAF or blocking mechanisms detected.
  3. WHOIS data is missing or unavailable, which reduces trustworthiness from a domain registration perspective.
  4. Strong privacy and cookie policies with consent mechanisms implemented.
  5. Contact information is clearly provided including phone, email, and contact forms.
  6. No explicit security headers detected in HTML source; potential area for improvement.
  7. Use of modern JavaScript libraries and analytics tools.
  8. No evidence of vulnerabilities or exposed sensitive data.
  9. No adult or questionable content detected.
Technical notes

Notes

The website is built on a modern JavaScript stack with RequireJS for module loading, Modernizr for feature detection, and Greensock TweenMax and Swiper.js for UI animations and sliders. It uses Piwik PRO for analytics, indicating a focus on privacy. The CMS appears to be Adobe Experience Manager, inferred from URL patterns and content structure. The site is mobile optimized with responsive images and preloading strategies. Performance is moderate, with asynchronous script loading and deferred JavaScript. Accessibility is basic but present. There is no explicit hosting provider information. The site could benefit from enhanced security headers and performance optimizations to reduce load times further.
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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