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Security report for nt-net.info

Stadtwerke Nürtingen GmbH · Energy · Germany

Medium risk. 4 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

75/100

Risk levelMedium

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

NT-net, operated by Stadtwerke Nürtingen GmbH, is a regional telecommunications provider focused on delivering highspeed internet and telephony services to private and business customers in Nürtingen, Germany. The company emphasizes local customer support, flexible contract terms without minimum duration, and early access to fiber optic infrastructure. Their offerings include multiple internet speed tiers and telephone flat rates, supported by downloadable product sheets and forms. The website is professionally designed, mobile-optimized, and uses modern technologies such as Neos CMS and a cookie consent manager. Security posture is solid with HTTPS and secure mail server configurations, though some security headers could be improved. Privacy compliance is well addressed with clear privacy and cookie policies and GDPR adherence. WHOIS data is unavailable, likely due to privacy protection, which slightly reduces transparency but does not detract significantly from trust given the consistent business information and local presence.

Scanned

NIS2 and GDPR posture

GDPR outside view
80/ 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

4 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 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 Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

  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
    • 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

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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
52
Security headers
55
Email security
80
DNS health
80
Network security
100
GDPR outside view
80
Average
75

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

NT-net operates as a local ISP under the umbrella of Stadtwerke Nürtingen GmbH, a municipal utility company. Their business model targets both private and commercial customers with tailored internet and telephony packages. The company leverages its position as a local utility to prioritize customers in fiber optic rollout projects, enhancing competitive advantage. Revenue streams include subscription fees for internet and telephone services, with promotional discounts such as new customer bonuses and referral incentives. The company maintains a partnership ecosystem including sw-nuertingen.de and bienenstrom.de, reinforcing its local utility network. Growth indicators include active marketing of new tariffs and student discounts. The website content and structure reflect a mature digital presence suitable for their market segment.

Security posture

The website demonstrates a moderate to good security maturity level. HTTPS is enforced, and secure mail server settings are published for customer use. Cookie consent management is implemented with user choice options, and analytics are self-hosted via Matomo, reducing third-party data exposure. However, the absence of explicit security headers like Content-Security-Policy and X-Frame-Options is a gap. No vulnerability disclosure policy or security.txt file is present, limiting transparency for security researchers. Incident response contact information is not provided. No exposed sensitive data or vulnerable libraries were detected in the HTML content. Overall, the security posture is adequate for a regional ISP but could be enhanced by adopting additional best practices and transparency measures.

Recommendations

  1. Implement and publish a security policy and incident response contact information to improve transparency and readiness.
  2. Add and enforce security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to strengthen browser security.
  3. Publish a vulnerability disclosure policy or security.txt file to encourage responsible reporting of security issues.
  4. Regularly audit third-party scripts and libraries for vulnerabilities and update them promptly.
  5. Enhance privacy compliance by documenting data retention policies and providing clearer user information on analytics data usage.

Contact details published on the site

Addresses
Legal name
Stadtwerke Nürtingen GmbH
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Stadtwerke Nürtingen GmbH
Description
NT-net is a telecommunications service provider offering highspeed internet and telephony services primarily in Nürtingen, Germany. They provide various internet packages with different bandwidths and telephone flat rates, focusing on local customer support and flexible contract terms.
Key services
Highspeed internet access, Telephone flat rate services, Customer support with on-site assistance, Flexible contract options without minimum term
Content quality
good
Branding
consistent

Technology

Stack
PHP, JavaScript, Neos CMS, Cookie Consent Manager CCM19, Matomo Analytics (self-hosted)
Frameworks
Flow PHP framework
Platforms
Neos CMS
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enforced
  • Cookie consent management implemented
  • No exposed sensitive data in HTML
  • Use of secure mail server settings (SSL/TLS)

Analytics and tracking

Services
Matomo (self hosted)
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Matomo (self hosted)
Marketing tools
Cookie Consent Manager CCM19
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 challenge.
  2. Content is professionally presented in German language targeting local customers.
  3. Strong emphasis on customer support and flexible contract terms.
  4. Use of modern CMS (Neos) and cookie consent management.
  5. No visible security or privacy policy documents beyond standard privacy and cookie policies.
  6. No visible security.txt or vulnerability disclosure policy.
  7. WHOIS data is unavailable, indicating privacy protection or query failure.
  8. Contact information is complete and consistent with business claims.
  9. No suspicious or malicious content detected.
Technical notes

Notes

The website is built on the Neos CMS platform using the Flow PHP framework, indicating a modern and flexible infrastructure. JavaScript libraries and cookie consent management tools are integrated to support user privacy and interactivity. The site loads multiple CSS and JS resources from its own domain and trusted partners, with asynchronous loading for performance. The presence of Matomo analytics shows a preference for privacy-conscious tracking. The site is mobile-optimized and accessible, with ARIA labels and keyboard navigation support. Performance is moderate, with no major issues detected. Technical debt appears low, but security header implementation and incident response mechanisms could be improved to reduce risk.
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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