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Security report for optimizer.nu

Cetetherm · Energy · Sweden

High risk. 9 critical or high findings in Network security, Security headers and 2 other checks.

Security score

48/100

Risk levelHigh

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

Cetetherm operates in the energy sector offering the Cetetherm Optimizer, a smart district heating solution that leverages IoT and AI to reduce heating costs and environmental impact. The company targets property owners and energy providers with a B2B model emphasizing sustainability and digital innovation. The website is built on WordPress, uses modern web technologies, and includes GDPR-compliant data collection mechanisms. Security posture is good with HTTPS and reCAPTCHA, though improvements like DNSSEC and security headers are recommended. Overall, the site is professional, trustworthy, and well-aligned with the business objectives.

Scanned

NIS2 and GDPR posture

GDPR outside view
50/ 100 · Medium
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

9 findings rated critical or high. Fix these first.

  1. Network security

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

    • Critical

      Critical Service Exposed: MySQL

      Port 3306 (MySQL) is publicly accessible - MySQL - Database server

      What to do: Immediately restrict access to MySQL using firewall or VPN

      • 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

  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. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • 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

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

Keep watching optimizer.nu

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.

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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
77
Security headers
15
Email security
85
DNS health
60
Network security
0
GDPR outside view
50
Average
48

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 · found on this site
  • 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

Cetetherm positions itself as an innovative energy technology provider with strategic partnerships such as Siemens, enhancing its market credibility. The business model focuses on delivering energy optimization products and services to residential and commercial building owners. The website content and case studies demonstrate measurable energy savings, supporting a strong value proposition. The company is relatively new (founded 2022) but leverages established industry relationships and modern technology to compete effectively in the sustainable energy market.

Security posture

The website enforces HTTPS and uses Google reCAPTCHA to protect forms, indicating a baseline security maturity. However, the absence of DNSSEC and security headers suggests room for improvement. No incident response or security policy information is published, which could be a gap in transparency and readiness. The cookie consent mechanism is robust and GDPR compliant, supporting privacy best practices. Overall, the security posture is adequate but could be enhanced with additional controls and published policies.

Recommendations

  1. Enable DNSSEC on the domain to strengthen DNS security.
  2. Implement HTTP security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  3. Publish a dedicated security policy and incident response contact information on the website.
  4. Consider adding a vulnerability disclosure policy or security.txt file to encourage responsible reporting.
  5. Enhance accessibility features to improve compliance and user experience for all visitors.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Cetetherm
Description
Cetetherm offers Cetetherm Optimizer, a smart, connected district heating central that reduces heating costs by 10-15% and improves energy efficiency for residential and commercial buildings. The solution integrates IoT, AI algorithms, and wireless sensors to optimize heating systems and reduce environmental impact.
Key services
Smart district heating central units, Energy optimization and monitoring, Web interface and API for energy companies, Support and maintenance service agreements
Content quality
good
Branding
consistent

Technology

Stack
WordPress 6.8.1, jQuery 3.7.1, Google reCAPTCHA v3, Slick Slider, Cookie Law Info plugin, WPForms plugin
Platforms
WordPress
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enforced
  • Use of Google reCAPTCHA v3 on forms
  • Cookie consent banner with granular controls

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Transparency
basic

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. Content is primarily in Swedish with English alternate language available.
  3. The site uses WordPress CMS with common plugins for forms and cookie compliance.
  4. Strong focus on energy efficiency and smart heating solutions.
  5. Contact form includes GDPR-compliant consent checkbox.
  6. No explicit terms of service found on the site.
  7. Cookie consent banner is present with detailed cookie categories and user controls.
  8. No social media links detected in the provided content.
  9. No phone numbers or physical addresses explicitly provided.
  10. Email contact provided in footer: optimizer@cetetherm.com
Technical notes

Notes

The website uses a standard WordPress CMS with common plugins for forms, cookie compliance, and sliders. The tech stack includes jQuery and Google reCAPTCHA v3, indicating modern but not cutting-edge technologies. Hosting is provided by Oderland, a reputable provider. Performance is moderate with room for optimization. The site is mobile responsive and SEO optimized with proper meta tags and alternate language links. Technical debt appears low, but security enhancements and accessibility improvements are recommended to future-proof the platform.
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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