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Security report for siedle.de

S. Siedle & Söhne, Telefon- und Telegrafenwerke OHG · Manufacturing · Germany

Medium risk. 10 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

54/100

Risk levelMedium

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

Siedle is a well-established German manufacturer specializing in building and door communication systems, including intercoms and access control solutions. With a history spanning 275 years, the company holds a strong market position as a leading European provider of high-quality, made-in-Germany products. Their offerings include traditional and IP-based video intercoms, digital services, and customer configurator tools, targeting builders, architects, and trade professionals. The website reflects a mature digital presence with modern technologies and a clear focus on user experience and product information. Technically, the website employs modern JavaScript frameworks, web components, and integrates consent management via Usercentrics, alongside Google Tag Manager for analytics and advertising. The site is mobile-optimized, accessible, and SEO-friendly, though some security headers could be more explicitly implemented. HTTPS is enforced, and no critical vulnerabilities or exposed sensitive data were detected. From a security perspective, the site demonstrates good practices including encrypted connections and cookie consent mechanisms. However, it lacks explicit security policies, incident response contacts, and vulnerability disclosure mechanisms, which are recommended for enhanced trust and compliance. Privacy policies and terms of service are comprehensive and GDPR compliant. Overall, the website is professional, trustworthy, and well-aligned with the company's business stature. Strategic improvements in security transparency and incident readiness would further strengthen its posture.

Scanned

NIS2 and GDPR posture

GDPR outside view
10/ 100 · Critical
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

10 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.

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

  2. 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';…

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

Keep watching siedle.de

This scan found 28 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
52
Security headers
15
Email security
85
DNS health
60
Network security
100
GDPR outside view
10
Average
54

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

Siedle operates in the manufacturing sector, focusing on building communication technology. Its competitive advantage lies in its long heritage, German manufacturing quality, and innovation in IoT-enabled intercom systems. The business model centers on product sales complemented by digital services and configurator tools. Target customers include construction professionals, architects, and end-users seeking reliable building communication solutions. The company maintains a strong brand presence with consistent messaging and active social media engagement. Growth is supported by product innovation such as the Siedle IQ IP-based system and a clear commitment to sustainability and regional engagement. Partnerships and service offerings enhance customer support and market reach.

Security posture

The website exhibits a mature security posture with enforced HTTPS, use of consent management for cookies, and integration of trusted analytics and advertising platforms. No critical vulnerabilities or exposed sensitive information were found in the HTML content. However, the absence of explicit security headers like X-Frame-Options and a published security policy or incident response contact reduces transparency. There is no security.txt or vulnerability disclosure page, which are best practices for responsible security management. Overall, the site is secure but could improve in formalizing and communicating its security governance and incident handling capabilities.

Recommendations

  1. Implement and explicitly configure security headers such as X-Frame-Options, Referrer-Policy, and Content-Security-Policy.
  2. Publish a dedicated security policy page including incident response contacts to enhance transparency and trust.
  3. Create and maintain a security.txt file to facilitate vulnerability disclosure and responsible reporting.
  4. Regularly audit third-party scripts and dependencies to ensure no vulnerable libraries are included.
  5. Enhance data retention transparency by publishing clear policies regarding analytics and user data.

Contact details published on the site

Addresses
Legal name
S. Siedle & Söhne, Telefon- und Telegrafenwerke OHG
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
S. Siedle & Söhne, Telefon- und Telegrafenwerke OHG
Description
Siedle ist einer der europaweit führenden Hersteller von Sprechanlagen: Gebäude- und Türkommunikation made in Germany. Im Jahr 2025 feiert das Unternehmen sein Jubiläum zum 275-jährigen Bestehen.
Key services
Manufacture of intercom systems, IP-based video intercoms, Access control systems, Digital services and platforms, Customer configurator tools, Support and service for trade and craft
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript ES Modules, Polyfills for older browsers, Google Tag Manager, Usercentrics Consent Management, Algolia Search, Web Components
Frameworks
Custom Web Components
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Consent management for cookies
  • No exposed sensitive data in HTML
  • Use of polyfills for compatibility

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Google Ads
Tracking pixels
Google Analytics (via GTM)
Marketing tools
Usercentrics Consent Management
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 and professionally designed.
  2. Strong emphasis on German manufacturing quality and tradition.
  3. Comprehensive navigation structure with detailed product and company information.
  4. Use of modern web technologies and consent management.
  5. No signs of malicious or suspicious content.
  6. Contact information is clearly provided in the footer.
  7. Social media presence across major platforms.
  8. No explicit security policy or incident response contact found.
  9. No vulnerability disclosure or security.txt file detected.
Technical notes

Notes

The website uses a modern tech stack including ES modules, polyfills for compatibility, web components, and integrates third-party services like Google Tag Manager and Usercentrics for consent management. The site is mobile-optimized and accessible, with good SEO practices evident in meta tags and structured navigation. Performance is moderate, likely due to multiple external scripts and rich media content. The CMS appears custom or proprietary, with no common CMS detected. Hosting provider details are not explicit. Technical risks are low but could be mitigated by optimizing script loading and enhancing security header implementation.
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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