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Security report for viessmann.de

Viessmann · Energy · Germany

Medium risk. 3 critical or high findings in GDPR outside view.

Security score

71/100

Risk levelMedium

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

Viessmann is a well-established enterprise in the energy sector, specializing in heating, cooling, ventilation, and integrated energy management solutions. The company emphasizes sustainability, renewable energy, and digital innovation, serving both private and professional customers across multiple countries. Their website reflects a mature digital presence with comprehensive product information, service offerings, and customer support tools. Technically, the site uses modern frameworks and consent management tools, ensuring GDPR compliance and good user experience. Security posture is strong with HTTPS, security headers, and no visible vulnerabilities. However, explicit security policies and incident response contacts are not publicly detailed. Overall, Viessmann demonstrates a high level of business credibility and digital maturity.

Scanned

This is an earlier scan of viessmann.de. View the latest report

NIS2 and GDPR posture

GDPR outside view
28/ 100 · High
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

3 findings rated critical or high. Fix these first.

  1. GDPR outside view

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

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • 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

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Keep watching viessmann.de

This scan found 21 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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  • 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
95
Security headers
80
Email security
60
DNS health
65
Network security
100
GDPR outside view
28
Average
71

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

Viessmann holds a leading market position in energy-efficient climate solutions, supported by awards and certifications. Their business model integrates product manufacturing with digital services and customer support, targeting both B2C and B2B segments. The company operates globally with multiple regional domains and subsidiaries. Their partnership ecosystem includes community platforms and partner portals, enhancing customer engagement and service delivery. Growth indicators include digital transformation initiatives and sustainability projects. The website content and structure support clear navigation and professional branding, reinforcing trust and market authority.

Security posture

The website exhibits a mature security posture with enforced HTTPS, comprehensive security headers, and consent management for privacy compliance. No exposed sensitive data or vulnerable libraries were detected. However, the absence of a dedicated security policy page, incident response contacts, and vulnerability disclosure mechanisms suggests room for improvement in transparency and incident readiness. The use of reputable third-party scripts is balanced with privacy controls. Overall, the security maturity is good but could be enhanced by publishing explicit security governance documents.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency.
  2. Implement and publicly disclose a vulnerability disclosure policy or security.txt file.
  3. Provide clear contact information for the Data Protection Officer and security incidents.
  4. Regularly audit and update third-party scripts to mitigate potential vulnerabilities.
  5. Enhance user education on privacy and security practices via website content.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Viessmann
Description
Heiz-, Kühl- und Lüftungstechnik, die Lebensräume gestaltet und das Klima schont. Integrierte Klima- und Energielösungen für jeden Bedarf mit Fokus auf Nachhaltigkeit, Qualität und Service.
Key services
Heating systems, Cooling systems, Ventilation systems, Energy management, Digital services (ViCare App, smart home integration), Consulting and support services
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Adobe Helix RUM, Google Tag Manager, Usercentrics Consent Management, Kameleoon A/B Testing
Frameworks
Adobe Helix, Usercentrics CMP
Platforms
Web
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Consent management implemented
  • No exposed sensitive data in HTML
  • Secure forms with consent
  • Use of reputable third-party scripts

Analytics and tracking

Services
Google Analytics (via GTM)
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Usercentrics, Kameleoon
Marketing tools
Usercentrics Consent Management, Kameleoon A/B Testing
Transparency
good

Site quality

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

Key observations

  1. Comprehensive and professional website with extensive product and service information.
  2. Strong focus on renewable energy and sustainability.
  3. Multiple language and regional versions available.
  4. Use of modern web technologies and consent management.
  5. No signs of malicious or suspicious activity.
  6. Good integration of digital services and customer support.
Technical notes

Notes

The website is built on Adobe Experience Manager, leveraging modern JavaScript frameworks and third-party tools like Usercentrics for consent management and Kameleoon for A/B testing. Hosting appears stable with UU.net nameservers. Performance is moderate with good mobile optimization and accessibility features. SEO is well implemented with comprehensive meta tags and Open Graph data. The technical stack supports scalability and integration with digital services, though continuous monitoring of third-party dependencies is advised to reduce technical debt and security risks.
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

Earlier scans of this domain

  1. 53/100Medium30 findingsView report
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