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Security report for rendsburgernetz-sh.de

Stadtwerke Rendsburg GmbH · Energy · Germany

Medium risk. 3 critical or high findings in Email security, SSL/TLS and 1 other check.

Security score

64/100

Risk levelMedium

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

Stadtwerke Rendsburg GmbH operates as a municipal utility network provider serving the Rendsburg region in Germany. The company manages multiple infrastructure networks including electricity, natural gas, heating, water, wastewater, and fiber optic services. It is part of a joint operation with other regional Stadtwerke under Stadtwerke SH, positioning itself as a reliable and modern infrastructure partner for local residents and businesses. The website reflects a professional municipal utility service with clear navigation and relevant service information. Technically, the site is built on TYPO3 CMS and employs Cookiebot for GDPR-compliant cookie management, indicating a moderate level of digital maturity. Security posture is adequate with HTTPS enabled and cookie consent implemented, but lacks published security policies or incident response contacts. Overall, the site is trustworthy and well-structured, though it could improve transparency by adding explicit privacy and security policy pages.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 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

3 findings rated critical or high. Fix these first.

  1. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

  2. 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

  3. Network security

    Services reachable from the internet are the first thing attackers probe. Anything open that does not need to be should be closed.

    • High

      High-Risk Service Exposed: FTP

      Port 21 (FTP) is publicly accessible - FTP - Often unencrypted file transfer

      What to do: Consider restricting access to FTP or implementing strong authentication

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection

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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
72
Security headers
90
Email security
60
DNS health
60
Network security
20
GDPR outside view
83
Average
64

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 holds a solid regional market position as a municipal utility network operator, leveraging partnerships with other Stadtwerke to enhance service delivery. Its business model focuses on infrastructure operation and customer service within regulated energy and utility sectors. The website targets local consumers and market partners, providing detailed information and forms for network services. The absence of direct contact emails or phone numbers on the site suggests a preference for in-person or formal communication channels. The partnership ecosystem includes related municipal services such as wastewater management. Growth indicators include investment in modern infrastructure and digital service portals. Strategic observations highlight the need for enhanced digital transparency and security communication to strengthen stakeholder trust.

Security posture

The website demonstrates a baseline security maturity with HTTPS enforced and a robust cookie consent mechanism via Cookiebot, supporting GDPR compliance. However, the absence of explicit security policies, incident response contacts, and security headers indicates room for improvement in security governance and transparency. No vulnerabilities or exposed sensitive data were detected in the provided content. The site does not reveal use of vulnerable libraries or insecure forms. Compliance gaps include missing published privacy and terms of service documents. The security culture appears moderate, with technical controls in place but lacking comprehensive policy communication. Enhancing these areas would improve the overall security posture and stakeholder confidence.

Recommendations

  1. Publish a comprehensive privacy policy and terms of service page accessible from the main navigation or footer.
  2. Implement and disclose a formal security policy including incident response procedures and contact channels.
  3. Add security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to enhance protection.
  4. Provide clear company contact information including emails and phone numbers for customer and security inquiries.
  5. Regularly audit and update third-party scripts and libraries to mitigate potential vulnerabilities.

Contact details published on the site

Addresses
Legal name
Stadtwerke Rendsburg GmbH
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Stadtwerke Rendsburg GmbH
Description
Wir sorgen für den verlässlichen und reibungslosen Betrieb unserer Stadtwerke Rendsburg GmbH Netze. Wir investieren in moderne und stabile Netze im Netzgebiet der Stadtwerke Rendsburg.
Key services
Electricity network, Natural gas network, Heating network, Water supply, Wastewater services, Fiber optic network, House connection services, Line information, Market partner information, Energy efficiency
Content quality
good
Branding
consistent

Technology

Stack
TYPO3 CMS, Cookiebot, JavaScript, CSS
Frameworks
TYPO3
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enabled
  • Cookie consent mechanism implemented

Analytics and tracking

Services
Cookiebot (consent management)
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Cookiebot pixel tracker
Marketing tools
Cookiebot
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. Uses TYPO3 CMS, a reputable open-source CMS.
  3. Cookie consent implemented via Cookiebot with detailed cookie categories.
  4. No explicit privacy policy or terms of service pages found in the provided content.
  5. Contact information limited to physical address; no emails or phone numbers explicitly found.
  6. No social media links detected.
  7. No security policy or incident response information published.
  8. Good accessibility features including skip links and accessibility options.
  9. No adult or questionable content detected.
  10. External links limited and mostly related to cookie consent and municipal services.
Technical notes

Notes

The website is built on TYPO3 CMS, a mature and widely used content management system, indicating a stable technical foundation. The use of Cookiebot for cookie consent reflects attention to privacy compliance. Hosting is managed via domaincontrol.com nameservers, suggesting use of GoDaddy or similar hosting providers. The site shows good mobile optimization and accessibility features such as skip links and accessibility toggles. Performance appears moderate with compressed CSS assets and asynchronous script loading. SEO is supported by meta tags and structured data (JSON-LD BreadcrumbList). Technical risks are minimal but could be reduced by implementing additional security headers and publishing security documentation. The site’s technical debt appears low, with opportunities for modernization focused on security and transparency 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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