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Security report for dehn.sk

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 specialized company focused on lightning and surge protection as well as safety equipment for buildings and electrical systems. With over a century of expertise, it serves primarily business clients in energy, industrial, and transportation sectors. The company offers a comprehensive range of products, consulting, training, and testing services, positioning itself as a trusted provider in its niche. The website reflects a professional and consistent brand image with clear navigation and relevant content. Technically, the site is built on Drupal 10, employs modern JavaScript, and includes Google Tag Manager for analytics. It is mobile-optimized and accessible, though performance is moderate. Security posture is good with HTTPS and cookie consent mechanisms, but lacks explicit security headers and incident response information. WHOIS data is missing, which slightly impacts trust but the website's transparency and contact details mitigate concerns. Overall, the site is credible and well-maintained, suitable for its target audience.

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

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.sk

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

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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

The company operates in the energy and transportation sectors, providing essential protection solutions against lightning and surges. Its business model is B2B, focusing on manufacturing, distribution, and value-added services like training and feasibility studies. The website indicates a medium-sized enterprise with a strong market position supported by a long history and a parent company, DEHN SE. The presence of multiple language options and international partner links suggests a global reach. The company leverages digital tools for marketing and analytics but could enhance transparency around security policies and incident handling. The clear contact information and social media presence support customer engagement and trust.

Security posture

The website enforces HTTPS and implements a cookie consent mechanism aligned with GDPR requirements, indicating good privacy compliance. However, it lacks visible security headers such as Content Security Policy or HSTS, which are recommended best practices. No vulnerabilities or exposed sensitive data were detected in the content. The absence of an incident response page or security contact emails limits the site's readiness for security incidents. Overall, the security posture is solid but could be improved by adding security headers and explicit incident response information to enhance trust and resilience.

Recommendations

  1. Implement standard security headers including CSP, HSTS, X-Frame-Options, and X-Content-Type-Options.
  2. Publish a dedicated security policy and incident response contact information on the website.
  3. Regularly audit and update third-party scripts to mitigate potential vulnerabilities.
  4. Enhance SEO by improving meta tags and structured data for better search engine visibility.
  5. Consider publishing a vulnerability disclosure policy or security.txt file to foster responsible reporting.

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 and surge protection solutions, Safety equipment, Consulting and feasibility studies, Training and seminars, Testing and certification services
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 detected

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 rich content and navigation.
  2. No WHOIS data available, indicating possible privacy protection or domain registration issues.
  3. Privacy and cookie policies are implemented with consent mechanisms.
  4. Contact information is clearly provided with company email, phone, and address.
  5. No explicit security policy or incident response information found.
  6. Website uses Drupal CMS and modern JavaScript frameworks.
  7. Social media presence on Facebook and YouTube is evident.
  8. No suspicious or malicious indicators detected in content or links.
Technical notes

Notes

The website is built on Drupal 10, a modern and widely supported CMS, ensuring a robust content management framework. JavaScript is used extensively for UI components and tracking via Google Tag Manager. The site is mobile-optimized and accessible, with good navigation and content structure. Performance is moderate, suggesting potential for optimization in image loading or script management. The absence of visible security headers and incomplete WHOIS data represent technical risks that should be addressed. Overall, the technical infrastructure supports the business needs but can benefit from security and performance enhancements.
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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