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Security report for dehn.cz

DEHN s.r.o. · Energy · Czech Republic

Medium risk. 5 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

74/100

Risk levelMedium

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

DEHN s.r.o. is a well-established company specializing in lightning and surge protection as well as safety equipment, serving primarily the energy, transportation, and industrial sectors. With over a century of expertise, the company offers comprehensive solutions including protection devices, consulting, training, and testing services. The website reflects a professional B2B business model targeting businesses and professionals requiring reliable protection systems. Technically, the site is built on Drupal 10, employs modern JavaScript frameworks, and integrates Google Tag Manager for analytics. The site is mobile-optimized and accessible, with clear navigation and good content quality. Security-wise, the site enforces HTTPS and includes cookie consent mechanisms, but lacks explicit security headers and incident response contacts. The absence of WHOIS data reduces domain trust, though the website content and contact information appear legitimate. Overall, the site demonstrates a solid digital presence with room for security enhancements.

Scanned

This is an earlier scan of dehn.cz. View the latest report

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

5 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 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

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

Keep watching dehn.cz

This scan found 18 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

Email alerts on material changes and an exportable JSON history of every change.

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Full report

€39.90one-time

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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
75
Security headers
25
Email security
85
DNS health
85
Network security
100
GDPR outside view
73
Average
74

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

DEHN s.r.o. holds a strong market position in the lightning and surge protection industry, leveraging its long history and technical expertise. The company targets industrial, energy, and transportation sectors with specialized products and services. Its business model focuses on manufacturing, distribution, and value-added services such as training and feasibility studies. The website supports multiple languages and international presence via partner sites. The company maintains active social media channels and provides comprehensive product information and documentation. Growth indicators include continuous product innovation and digital tools like DEHNsupport. The partnership ecosystem includes international DEHN sites, enhancing global reach.

Security posture

The website demonstrates a mature security posture with HTTPS enforced and a cookie consent mechanism aligned with GDPR requirements. However, the lack of visible security headers such as Content-Security-Policy and absence of explicit security or incident response policies are gaps. No vulnerabilities or exposed sensitive data were detected in the analysis. The missing WHOIS data is a concern for domain legitimacy but does not directly impact website security. Overall, the security maturity is good but could be improved by adding security headers and incident response information.

Recommendations

  1. Implement standard security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to enhance protection against common web attacks.
  2. Publish a dedicated security policy and incident response contact information to improve transparency and trust.
  3. Regularly audit third-party scripts and dependencies to ensure no vulnerable libraries are included.
  4. Improve WHOIS data availability or transparency to enhance domain trustworthiness.
  5. Maintain and update privacy and cookie policies to stay compliant with evolving regulations.

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
Reliable protection of buildings, electrical and electronic systems and human life.
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, JavaScript, Google Tag Manager
Frameworks
Drupal CMS
Performance
moderate
Mobile
good
Accessibility
good
SEO
basic

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent mechanism implemented
  • No exposed sensitive data found

Analytics and tracking

Services
Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

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. WHOIS data is unavailable, which is unusual and reduces domain trust.
  3. Comprehensive cookie consent and privacy policy are implemented.
  4. Contact information is clearly provided with physical address, phone, and email.
  5. Website uses modern Drupal 10 CMS and includes Google Tag Manager for analytics.
  6. No explicit security policy or incident response contact found.
  7. Social media presence includes Facebook and YouTube channels.
  8. Website content is in Czech language with multi-language support links.
  9. No visible vulnerabilities or exposed sensitive data detected.
Technical notes

Notes

The website is built on Drupal 10 CMS, indicating a modern and maintainable platform. It uses JavaScript extensively for UI components and integrates Google Tag Manager for analytics. The site is mobile-optimized and accessible, with responsive images and ARIA attributes. Performance is moderate, with multiple asynchronously loaded scripts. No major technical debt or deprecated technologies were detected. Opportunities exist to improve SEO by enhancing meta tags and structured data. Hosting provider details were not identified. Overall, the technical infrastructure supports a professional and functional web 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

Earlier scans of this domain

  1. 71/100Medium29 findingsView report
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