Security report for abwasser-rendsburg.de
Abwasserbeseitigung Rendsburg · Energy · Germany
Abwasserbeseitigung Rendsburg is a municipal utility service responsible for wastewater disposal and treatment in the city of Rendsburg and surrounding areas including Büdelsdorf. The organization operates a dedicated sewage treatment plant and provides related services such as property drainage management. The website serves as an informational portal for residents and businesses, offering updates, contact information, and access to service-related forms. The market position is that of a local government service provider with a clear focus on environmental and public utility functions. Technically, the website is built on the Contao Open Source CMS platform, utilizing standard web technologies including HTML5, CSS, JavaScript, and jQuery. The site is hosted on infrastructure associated with Schleupen, a known service provider. While the site is functional and moderately optimized for mobile devices, it lacks advanced SEO and accessibility features. The absence of modern security headers and cookie consent mechanisms indicates room for improvement in technical security and privacy compliance. From a security perspective, the site uses HTTPS and includes CSRF tokens in forms, which are positive indicators. However, no explicit security policies, incident response contacts, or vulnerability disclosure mechanisms are present. The WHOIS data aligns well with the website's municipal nature, showing consistent domain registration and no privacy protection, supporting legitimacy. Overall, the security posture is moderate but could benefit from enhanced headers, policies, and transparency. The overall risk assessment is low given the nature of the business and the absence of sensitive data exposure or suspicious activity. Strategic recommendations include implementing security headers, adding cookie consent and privacy enhancements, publishing security and incident response policies, and updating technical components to modern standards to improve trust and compliance.
Scanned
NIS2 and GDPR posture
- NIS2 outside view
- Not assessed
- GDPR outside view
- Not assessed
Both readouts depend on the site's pages, which could not be loaded in this scan.
Priority findings
4 findings rated critical or high. Fix these first.
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
- High
No SPF record found
SPF helps prevent email spoofing
What to do: Add SPF record: "v=spf1 include:_spf.yourmailprovider.com ~all"
- RFC 7208
- NIS2 21(2)(e)
- IR 2024/2690 6.7.2(k): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(k): Network security
- NIST SP 800-177r1
- Critical
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
- RFC 8996
- RFC 7568
- Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: tls_versions TLSv1.2, TLSv1.3
- NIS2 21(2)(h)
- IR 2024/2690 9.2(b): Implementing Regulation (EU) 2024/2690, Annex point 9.2(b): Cryptography
- NIST SC-8(1): NIST SP 800-53 Rev. 5 SC-8(1): Cryptographic Protection
- High
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
- High
Need hands-on remediation? Email guard@offseq.com
Keep watching abwasser-rendsburg.de
This scan found 18 issues across 4 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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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
- Email security
- 40
- DNS health
- 60
- Network security
- 20
- Average
- 48
Not counted
- Security headers: did not complete in this scan.
- GDPR outside view: did not complete in this scan.
- 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
Security posture
Recommendations
- Implement HTTP security headers including CSP, HSTS, X-Frame-Options, and X-Content-Type-Options to enhance protection against common web attacks.
- Add a cookie consent banner and clearly document cookie usage to improve GDPR compliance and user privacy transparency.
- Publish a formal security policy and incident response plan on the website to increase trust and preparedness.
- Regularly update all JavaScript libraries and CMS components to mitigate vulnerabilities from outdated software.
- Enhance accessibility and mobile optimization to improve user experience and broaden audience reach.
Contact details published on the site
Site observations
Automated reading of the public site. Ratings are indicative.
Business
- Company
- Abwasserbeseitigung Rendsburg
- Description
- Der Abwasserbetrieb der Stadt Rendsburg entsorgt alle Abwässer in der Stadt Rendsburg und dem Umlad und bereitet sie im betriebseigenen Klärwerk auf.
- Key services
- Wastewater disposal, Wastewater treatment, Grundstücksentwässerung (property drainage), Klärwerk operation (sewage treatment plant)
- Content quality
- good
- Branding
- consistent
Technology
- Stack
- HTML5, CSS, JavaScript, jQuery 1.11.4, Colorbox 1.6.1
- Performance
- moderate
- Mobile
- basic
- Accessibility
- basic
- SEO
- basic
Security
- Observed score
- 60/100
- Good practices seen
- Use of HTTPS (implied by base href https://abwasser-rendsburg.de/)
- Use of CSRF token in form (REQUEST_TOKEN field)
Analytics and tracking
- Tracking level
- minimal
- Privacy practices
- basic
Advertising
- Transparency
- poor
Site quality
- Design
- basic
- User experience
- basic
- Content relevance
- good
- Navigation
- good
- Professionalism
- basic
- Trustworthiness
- moderate
Key observations
- Website is a municipal utility site for wastewater management in Rendsburg, Germany.
- Content is in German and targeted at local residents and businesses.
- No privacy or cookie banners detected, but privacy policy page exists.
- No visible security policy or incident response information.
- Uses Contao CMS and jQuery with some UI plugins.
- No advertising or tracking services detected.
- Contact information is clearly provided including email, phone, and physical address.
- No social media links found.
- No structured data (JSON-LD or Open Graph) detected in HTML head.
- No terms of service or vulnerability disclosure pages found.
Technical notes
Notes
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.
- MITRE CWE (opens in a new tab)4.20 (2026-04-30) · CWE Terms of Use (free use with attribution, © MITRE)
- OWASP Top 10:2025 (opens in a new tab)2025 (membership per CWE 4.20) · CC BY-SA 4.0
- MITRE CAPEC (opens in a new tab)3.9 (2023-01-24) · CAPEC Terms of Use (free use with attribution, © MITRE)
- OWASP ASVS (opens in a new tab)5.0.0 · CC BY-SA 4.0
- OWASP Web Security Testing Guide (opens in a new tab)latest (checklist.json, master) · CC BY-SA 4.0
- OWASP Secure Headers Project (opens in a new tab)2026-10-18 · Apache-2.0
- Mozilla Server Side TLS (intermediate) (opens in a new tab)6.0 · MPL-2.0
- NIST SP 800-53 Rev. 5 (OSCAL catalog) (opens in a new tab)5.2.0 · Public domain (US Government work)
- Directive (EU) 2022/2555 (NIS2) (opens in a new tab)OJ L 333, 27.12.2022 · EUR-Lex reuse under Commission Decision 2011/833/EU (© European Union)
- Commission Implementing Regulation (EU) 2024/2690 (opens in a new tab)OJ L, 18.10.2024 · EUR-Lex reuse under Commission Decision 2011/833/EU (© European Union)
- Regulation (EU) 2016/679 (GDPR) (opens in a new tab)OJ L 119, 4.5.2016 · EUR-Lex reuse under Commission Decision 2011/833/EU (© European Union)
- Directive 2002/58/EC (ePrivacy), consolidated (opens in a new tab)19.12.2009 · EUR-Lex reuse under Commission Decision 2011/833/EU (© European Union)
- RFC Editor metadata (opens in a new tab)per-RFC (obsolete RFCs rejected) · IETF Trust Legal Provisions (metadata only)
- NIST CSRC, W3C TR, IETF Datatracker, EDPB, EUR-Lex CELLAR and gesetze-bayern.de (opens in a new tab)per document · Titles and links only
- NIST NVD CVE API 2.0 (opens in a new tab)live records · Public domain (NVD); CVE® records © MITRE, free use
- W3C WCAG 2.2 (opens in a new tab)W3C Recommendation (wcag.json) · W3C Software and Document License
- ETSI EN 301 549 (opens in a new tab)V3.2.1 (2021-03), clause headings · Clause numbers and titles only (© ETSI)
- Directive (EU) 2019/882 (European Accessibility Act) (opens in a new tab)OJ L 151, 7.6.2019 · EUR-Lex reuse under Commission Decision 2011/833/EU (© European Union)
- Directive (EU) 2016/2102 (Web Accessibility Directive) (opens in a new tab)OJ L 327, 2.12.2016 · EUR-Lex reuse under Commission Decision 2011/833/EU (© European Union)
Retrieved 2026-10-25
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