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Security report for zenner.com

Zenner International GmbH & Co. KG · Energy · Germany

Medium risk. 3 critical or high findings in Security headers and DNS health.

Security score

72/100

Risk levelMedium

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

Zenner International GmbH & Co. KG is a well-established global leader in manufacturing water, heat, and gas meters, along with digital metering solutions leveraging IoT and LoRaWAN® technologies. The company targets utility providers and industrial customers worldwide, with a strong presence in Europe, Asia, and Latin America. Their website reflects a mature digital presence built on WordPress, showcasing a broad product portfolio with detailed descriptions and multilingual support. Technically, the site uses modern web technologies and common plugins, providing a good user experience with mobile optimization and SEO best practices. Security posture is adequate with HTTPS and cookie consent mechanisms, but lacks some advanced security headers and explicit incident response information. The domain registration data is consistent with the company's claims, showing a long-standing and legitimate online presence. Overall, the website is professional and trustworthy but could improve privacy transparency and security practices.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 100 · Low
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. 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 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. DNS health

    DNS sends visitors and email to the right servers. Misconfigured records can cause outages or let someone redirect your traffic.

    • High

      Domain Expires Soon

      Domain expires in 17 days

      What to do: Renew domain registration before expiration

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

Keep watching zenner.com

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.

Daily monitoring

Recommended

€25per month

  • 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
30
Email security
70
DNS health
55
Network security
100
GDPR outside view
83
Average
72

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

Zenner operates in the energy sector, focusing on metering hardware and digital solutions for water, heat, and gas consumption measurement. Their competitive advantage lies in integrating IoT and radio communication technologies like LoRaWAN® for remote reading and system monitoring. The business model combines product manufacturing with digital services, targeting utilities and industrial clients. The company demonstrates growth by expanding gas meter availability into European markets since 2021 and maintaining a strong global footprint. Their partnership ecosystem includes online shops and social media engagement. The website content and structured data reinforce their market position as a technology-driven energy metering provider.

Security posture

The website enforces HTTPS and uses a cookie consent mechanism, indicating awareness of privacy and security requirements. However, DNSSEC is not enabled, and several important security headers such as Content-Security-Policy, X-Content-Type-Options, and Referrer-Policy are missing, which could expose the site to certain web-based attacks. There is no visible security policy or incident response contact information, and no vulnerability disclosure or security.txt file is present. These gaps suggest room for improvement in transparency and proactive security management. No critical vulnerabilities or exposed sensitive data were detected in the analysis.

Recommendations

  1. Enable DNSSEC to enhance domain name system security.
  2. Implement a comprehensive Content-Security-Policy header to mitigate cross-site scripting risks.
  3. Publish a clear privacy policy and terms of service accessible from the main navigation.
  4. Add a security.txt file and incident response contact details to improve transparency and trust.
  5. Include additional security headers such as X-Content-Type-Options and Referrer-Policy.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Zenner International GmbH & Co. KG
Description
ZENNER is a global leading manufacturer of water meters, heat and cooling energy meters, gas meters, submetering and digital solutions for remote reading. They offer innovative M-Bus and radio solutions, IoT and LoRaWAN® technology.
Key services
Water meters, Heat and cooling energy meters, Gas meters, Submetering, Digital remote reading solutions, Communication technologies (LoRaWAN®, M-Bus, Wireless M-Bus)
Content quality
good
Branding
consistent

Technology

Stack
jQuery, WordPress, PHP, Yoast SEO, Borlabs Cookie, Select2, Fancybox, Slick Slider
Frameworks
WordPress
Platforms
WordPress CMS
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
70/100
Good practices seen
  • HTTPS enforced
  • ClientTransferProhibited domain status
  • Use of cookie consent mechanism

Analytics and tracking

Tracking level
minimal
Privacy practices
basic

Advertising

Marketing tools
Borlabs Cookie
Transparency
basic

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Content is comprehensive about metering products and solutions.
  3. No explicit privacy policy or terms of service found on the homepage or main navigation.
  4. Cookie consent is implemented via Borlabs Cookie plugin.
  5. Contact information is provided via a contact page but no direct emails or phone numbers found in the main content.
  6. Social media presence includes Facebook and Twitter (X).
  7. Technical stack is modern and based on WordPress with common plugins.
  8. Security headers are partially implemented; room for improvement.
  9. No visible vulnerability disclosure or security.txt file.
  10. No data protection officer contact found.
Technical notes

Notes

The website is built on WordPress CMS with a modern tech stack including jQuery, Yoast SEO, Borlabs Cookie for consent management, and slick slider for product display. The site is mobile optimized and uses responsive images. Hosting details are not explicit but DNS uses managed-ip.com name servers. Performance is moderate with no major issues detected. Accessibility is basic with some screen reader navigation aids. SEO is well addressed with meta tags, Open Graph, and JSON-LD structured data describing the organization and products. The site uses multiple external resources but no suspicious or malicious domains were found. Overall, the technical infrastructure supports a professional and functional online presence.
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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