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Security report for co2-rechner.de

KlimAktiv gemeinnützige Gesellschaft zur Förderung des Klimaschutzes mbH · Government · Germany

Medium risk. 7 critical or high findings in Email security, Security headers and 2 other checks.

Security score

52/100

Risk levelMedium

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

The CO2-Rechner website is an official environmental tool operated by KlimAktiv on behalf of the German Umweltbundesamt (UBA). It provides a comprehensive CO2 footprint calculator that includes multiple greenhouse gases and covers various lifestyle aspects. The site targets private individuals, municipalities, and event organizers, offering detailed calculation tools and educational resources. The platform is well-positioned as a government-backed, scientifically supported service with strong trust signals and consistent branding. Technically, the website employs modern frameworks such as Bootstrap 5 and Alpine.js, integrates advanced charting libraries (AmCharts 5), and uses Klaro for GDPR-compliant cookie consent. Hosting is managed via DomainControl nameservers, and analytics are handled by Matomo with anonymized IP tracking, reflecting a privacy-conscious approach. The site is mobile-optimized, accessible, and SEO-friendly, with a professional design and clear navigation. From a security perspective, the site enforces HTTPS and uses secure cookie management. However, no explicit security policy or incident response contact is published, and HTTP security headers are not evident in the provided data. No vulnerabilities or suspicious content were detected. Privacy compliance is strong, with a detailed privacy policy and data protection officer contact provided. Overall, the website demonstrates a high level of professionalism, trustworthiness, and compliance suitable for a government environmental service. Strategic improvements could include publishing a formal security policy, adding security headers, and establishing a vulnerability disclosure process to further enhance security posture and user trust.

Scanned

NIS2 and GDPR posture

GDPR outside view
95/ 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

7 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. 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';…

  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

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

Keep watching co2-rechner.de

This scan found 26 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
62
Security headers
15
Email security
60
DNS health
60
Network security
20
GDPR outside view
95
Average
52

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

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention co2-rechner.de, from OffSeq Breach.

No leaked records found

Breach holds no records for co2-rechner.de right now. New leaks arrive continuously, so monitoring on Breach alerts you if that changes.

Monitor on Breach (opens in a new tab)

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

The CO2-Rechner is positioned as a key digital service in Germany's environmental and climate protection ecosystem. It leverages partnerships with KlimAktiv and the ifeu institute to provide scientifically robust data and methodologies. The business model is non-profit, focusing on public service and education. The target audience includes environmentally conscious individuals, municipalities, and event organizers seeking to measure and reduce their carbon footprint. The platform's integration with government agencies and scientific partners strengthens its credibility and market position. Growth potential lies in expanding user engagement, integrating more data sources, and enhancing policy simulation features. The partnership ecosystem is well-established with trusted environmental organizations, supporting sustainable operations and outreach.

Security posture

The website exhibits a mature security posture with mandatory HTTPS encryption and privacy-respecting analytics. The use of Klaro for cookie consent aligns with GDPR requirements. No exposed sensitive data or vulnerable libraries were found in the HTML content. However, the absence of explicit security headers (e.g., CSP, HSTS) and lack of a published security or incident response policy represent areas for improvement. No incident response or abuse contact channels are provided, which could hinder timely handling of security events. Overall, the site is secure for typical user interactions but would benefit from enhanced transparency and formalized security processes to meet best practices and regulatory expectations.

Recommendations

  1. Implement and enforce HTTP security headers such as Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, and X-Content-Type-Options.
  2. Publish a clear security policy and incident response contact information on the website to improve transparency and readiness.
  3. Establish a vulnerability disclosure program or security.txt file to facilitate responsible reporting of security issues.
  4. Regularly audit third-party libraries and dependencies to ensure no known vulnerabilities are present.
  5. Enhance user trust by providing more visible trust seals, certifications, or endorsements related to security and privacy.

Contact details published on the site

Addresses
Legal name
KlimAktiv gemeinnützige Gesellschaft zur Förderung des Klimaschutzes mbH
VAT number
DE811317238
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
KlimAktiv gemeinnützige Gesellschaft zur Förderung des Klimaschutzes mbH
Description
Der CO2-Rechner des Umweltbundesamtes ist ein Online-Tool zur Berechnung des persönlichen CO2-Fußabdrucks, das neben CO2 auch weitere Treibhausgase berücksichtigt. Es richtet sich an Privatpersonen, Kommunen und Veranstalter, um Emissionen zu erfassen und Klimaschutzmaßnahmen zu planen.
Key services
CO2 footprint calculation, Climate policy simulation, Educational materials and resources
Content quality
excellent
Branding
consistent

Technology

Stack
Bootstrap 5, Alpine.js, Tom Select, AmCharts 5, Klaro Cookie Consent, Matomo Analytics
Frameworks
Bootstrap, Alpine.js
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Secure cookie consent with Klaro
  • No exposed sensitive data in HTML
  • Use of secure analytics (Matomo) with anonymized IP

Analytics and tracking

Services
Matomo
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Matomo
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is an official government-backed environmental tool for CO2 footprint calculation.
  2. Comprehensive privacy and imprint information provided in German.
  3. Uses modern web technologies and frameworks.
  4. Includes cookie consent mechanism compliant with GDPR.
  5. No signs of malicious or suspicious content.
  6. Strong branding consistency with Umweltbundesamt and KlimAktiv.
  7. No terms of service page found.
  8. No explicit security policy or incident response contact found.
  9. Uses Matomo analytics with anonymized IP addresses.
Technical notes

Notes

The website is built on a modern and maintainable technology stack including Bootstrap 5 for responsive design, Alpine.js for reactive UI components, and AmCharts 5 for interactive data visualization. Klaro.js is used for GDPR-compliant cookie management, and Matomo provides privacy-focused analytics. The site is hosted on infrastructure using DomainControl nameservers, indicating professional domain management. Performance is moderate with deferred script loading and asynchronous analytics. Accessibility and SEO are well addressed with proper meta tags, language attributes, and structured navigation. There is no evidence of a CMS, suggesting a custom or static site architecture. Opportunities exist to improve security headers and formalize security documentation to reduce technical 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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