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Security report for viessmann.group

Viessmann Generations Group GmbH & Co. KG · Energy · Germany

Medium risk. 4 critical or high findings in GDPR outside view and SSL/TLS.

Security score

70/100

Risk levelMedium

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

Viessmann Generations Group GmbH & Co. KG operates as an impact-driven investment ecosystem focused on sustainable and long-term investments across energy, environmental, and social sectors. The company emphasizes co-creating living spheres for future generations by investing in majority, minority, generational, and early-stage innovation ventures. Their portfolio includes companies specializing in grid infrastructure, district heating and cooling, clean cold solutions, renewable energy, and health-related sectors. The website reflects a mature digital presence with professional design, clear navigation, and comprehensive content that aligns with their business objectives. Technically, the website is built on Webflow with modern JavaScript libraries such as GSAP and Lenis for smooth animations and scrolling. It integrates Google Tag Manager and Usercentrics CMP for analytics and privacy compliance, respectively. The site is well-optimized for performance and mobile responsiveness, with good accessibility and SEO practices observed. From a security perspective, the site enforces HTTPS and uses privacy-compliant cookie consent mechanisms. While explicit security headers are not fully confirmed, no vulnerabilities or exposed sensitive data were detected. The WHOIS data is limited due to TLD restrictions and privacy protection but does not raise legitimacy concerns. Overall, the security posture is solid but could be enhanced by publishing explicit security policies and incident response contacts. The overall risk assessment is low, with the company demonstrating strong business credibility, compliance with privacy regulations, and a professional online presence. Strategic recommendations include enhancing security header implementation, publishing a security policy, and adding vulnerability disclosure mechanisms to further strengthen trust and resilience.

Scanned

NIS2 and GDPR posture

GDPR outside view
65/ 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. 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

  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

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Keep watching viessmann.group

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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
57
Security headers
60
Email security
60
DNS health
80
Network security
100
GDPR outside view
65
Average
70

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 Generations Group holds a strong market position as a large investment entity focused on sustainable energy and impact investing. Their diversified portfolio and strategic partnerships, including a significant stake in Carrier Global, provide competitive advantages in the green energy transition. The business model leverages majority and minority investments, generational asset management, and early-stage innovation funding to drive systemic change. Revenue streams likely derive from investment returns and operational synergies within their ecosystem. The target customer segments include institutional investors, strategic partners, and impact-focused stakeholders. Growth indicators include expanding portfolio companies and active ecosystem multipliers. The company maintains a robust partnership ecosystem and demonstrates strategic foresight in aligning investments with global sustainability goals.

Security posture

The website exhibits a mature security posture with enforced HTTPS, use of a consent management platform for GDPR compliance, and no visible exposure of sensitive data. The integration of Google Tag Manager is managed with ads data redaction enabled, indicating privacy-conscious analytics. However, explicit security headers such as Content-Security-Policy and X-Content-Type-Options are not clearly present and should be verified. There is no published security policy or incident response contact, which are recommended best practices. No vulnerabilities or outdated libraries were detected in the client-side code. The absence of a security.txt or vulnerability disclosure page limits transparency in security incident handling. Overall, the security maturity is good but can be improved with formalized policies and enhanced header configurations.

Recommendations

  1. Implement and verify comprehensive security headers including Content-Security-Policy, X-Content-Type-Options, and Referrer-Policy.
  2. Publish a clear security policy and incident response contact information on the website.
  3. Establish a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  4. Regularly audit third-party scripts and libraries for security vulnerabilities and update as needed.
  5. Enhance accessibility features to meet or exceed WCAG standards for broader compliance and user inclusivity.

Contact details published on the site

Addresses
Legal name
Viessmann Generations Group GmbH & Co. KG
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Viessmann Generations Group GmbH & Co. KG
Description
Viessmann Generations Group is an impact-driven ecosystem with a clear purpose: to co-create living spheres for generations to come. They invest across thematic fields such as greenhouse gases, air quality, food, water quality, health & well-being, education & sciences, and democratic values.
Key services
Majority Investments in regional market leaders, Minority Investments alongside strong partners, Generational Investments in real estate, forestry, agriculture, Early-Stage Innovation funding, Ecosystem Multipliers through strategic partnerships, Philanthropic initiatives
Content quality
excellent
Branding
consistent

Technology

Stack
Webflow, Google Tag Manager, Usercentrics CMP, Lenis smooth scrolling, GSAP animation library, Finsweet attributes
Performance
fast
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Use of consent management platform for privacy
  • No exposed sensitive data in HTML
  • No vulnerable libraries detected

Analytics and tracking

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

Advertising

Marketing tools
Usercentrics CMP
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 no blocking or WAF challenges.
  2. Content is rich, professionally presented, and focused on investment and sustainability.
  3. Strong presence of privacy and cookie policies with GDPR compliance.
  4. No direct email addresses or phone numbers found in the visible content; contact likely via forms or social media.
  5. Use of modern web technologies and analytics tools.
  6. WHOIS data limited but consistent with a legitimate corporate entity.
Technical notes

Notes

The website is built using Webflow CMS, leveraging modern JavaScript libraries such as GSAP for animations and Lenis for smooth scrolling. It uses Usercentrics for cookie consent management and Google Tag Manager for analytics and marketing tags. The hosting is via Webflow's CDN, ensuring fast content delivery and good performance. The site is mobile-optimized with responsive design and includes accessibility considerations such as focus outlines and keyboard navigation support. SEO is supported by proper meta tags and structured content. The technical stack is modern and well-maintained, with no apparent technical debt or performance bottlenecks. Opportunities exist to enhance security headers and formalize security policies to reduce technical 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

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