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Security report for dehn.cz

DEHN s.r.o. · Energy · Czech Republic

Medium risk. 6 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

71/100

Risk levelMedium

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

DEHN s.r.o. is a Czech-based company specializing in lightning and surge protection as well as safety equipment for buildings, electrical and electronic systems, and human life protection. The company leverages over a century of expertise, positioning itself as a trusted provider in the energy and industrial sectors. Their website offers comprehensive product information, educational resources, and service offerings, targeting professional and business customers. The digital presence is supported by a modern Drupal 10 CMS infrastructure, enhanced with cookie consent management and analytics tools such as Google Tag Manager and Datadog RUM. The site is well-structured, mobile-optimized, and provides clear contact information and social media links, reinforcing business credibility.

Scanned

NIS2 and GDPR posture

GDPR outside view
73/ 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 dehn.cz

This scan found 20 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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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
25
Email security
85
DNS health
85
Network security
100
GDPR outside view
73
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

The company operates primarily in the energy and transportation sectors, offering specialized protection solutions including lightning protection systems, surge protection devices, and safety equipment. Their business model is B2B, focusing on supplying products and services to industrial clients and infrastructure projects. The presence of DEHNacademy and testing centers indicates a value-added service approach, enhancing customer engagement and expertise sharing. The website's multilingual options and international partner links suggest a global market reach. The company maintains consistent branding and professional content, supporting a medium-sized enterprise profile with a strong market position in the Czech Republic and beyond.

Security posture

The website enforces HTTPS and employs cookie consent mechanisms, indicating attention to privacy and security compliance. However, explicit security headers such as Content-Security-Policy and X-Frame-Options are not evident, representing an area for improvement. No vulnerabilities or exposed sensitive data were detected in the HTML content. The absence of a dedicated security policy or incident response contact limits transparency in security governance. Overall, the security posture is solid but could benefit from enhanced header configurations and published security policies to improve trust and compliance.

Recommendations

  1. Implement comprehensive security headers including CSP, X-Frame-Options, and X-Content-Type-Options to mitigate common web attacks.
  2. Publish a dedicated security policy and incident response contact information to enhance transparency and readiness.
  3. Regularly audit and update third-party scripts and libraries to prevent vulnerabilities.
  4. Enhance SEO optimization by improving meta tags and structured data for better search engine visibility.
  5. Maintain and update privacy and cookie policies to reflect evolving regulations and best practices.

Contact details published on the site

Addresses
Legal name
DEHN s.r.o.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
DEHN s.r.o.
Description
Specializes in lightning and surge protection, safety equipment for buildings, electrical and electronic systems, and human life protection.
Key services
Lightning protection systems, Surge protection devices, Safety equipment, Consulting and training (DEHNacademy), Testing and feasibility studies
Content quality
good
Branding
consistent

Technology

Stack
Drupal 10, Usercentrics (cookie consent), Google Tag Manager, Datadog RUM
Frameworks
Drupal CMS
Performance
moderate
Mobile
good
Accessibility
good
SEO
basic

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism implemented
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Tag Manager, Datadog RUM
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Datadog RUM
Marketing tools
Usercentrics cookie consent
Transparency
good

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 in Czech language targeting local and international customers.
  3. Strong focus on lightning and surge protection products and services.
  4. Uses modern web technologies and cookie consent management.
  5. WHOIS data is unavailable, likely due to privacy protection or registry policy.
  6. Contact information is clearly presented in footer with phone, email, and address.
  7. Social media presence on Facebook and YouTube is active.
  8. No explicit privacy or security policy pages beyond standard GDPR and cookie consent.
  9. No visible security incident or vulnerability disclosure information.
Technical notes

Notes

The website is built on Drupal 10, a modern and widely supported CMS, ensuring a robust content management framework. The use of Usercentrics for cookie consent and Google Tag Manager for analytics reflects a mature approach to privacy and data collection. Performance is moderate with asynchronous loading of scripts and responsive design for mobile devices. Accessibility features such as skip links and ARIA roles are present, supporting usability. Opportunities exist to improve SEO and security header implementation. Hosting details are not explicitly identified, but the presence of CDN and privacy proxy services suggests a professional hosting environment.
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. 74/100Medium27 findingsView report
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