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Security report for united-internet.de

United Internet AG · Technology · Germany

Low risk. 2 critical or high findings in Security headers and SSL/TLS.

Security score

78/100

Risk levelLow

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

United Internet AG is a leading European internet specialist operating a broad portfolio of internet access, cloud applications, email services, domain registration, and media brands. The company serves both consumer and business markets with approximately 29 million customer contracts and 39 million free accounts. Their market position is strong, supported by multiple well-known subsidiaries such as 1&1, GMX, WEB.DE, and IONOS. The website reflects a mature enterprise with comprehensive investor relations and corporate governance disclosures. Technically, the website is built on TYPO3 CMS, leveraging modern web standards including HTML5 video and responsive design. The site is well-optimized for mobile and accessibility, with good SEO practices and a moderate performance profile. Hosting appears to be managed internally or through trusted infrastructure, with no signs of performance bottlenecks or outdated technology. From a security perspective, the site enforces HTTPS and implements a cookie consent mechanism with opt-in for analytics, demonstrating GDPR compliance. No critical vulnerabilities or exposed sensitive data were detected. However, explicit security policies and incident response contacts are not publicly available, which could be improved to enhance transparency and trust. Overall, the website is professional, trustworthy, and compliant with privacy regulations. The domain WHOIS data aligns with the business claims, reinforcing legitimacy. Strategic recommendations include publishing dedicated security and incident response policies and enhancing security headers to further strengthen the security posture.

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

2 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 X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

  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

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

Keep watching united-internet.de

This scan found 19 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

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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
70
Email security
65
DNS health
70
Network security
100
GDPR outside view
83
Average
78

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

United Internet AG operates in the technology and telecommunications sectors, focusing on internet services and cloud applications. Their business model centers on providing internet access and digital services to a large European customer base, both consumers and enterprises. Revenue streams include subscription services, domain registrations, cloud hosting, and media advertising. The company maintains a strong brand portfolio and international presence across multiple countries. Growth indicators include recent investor news and stock market presence. The partnership ecosystem includes multiple subsidiary brands and a dedicated integrity line for whistleblowing. Strategic observations highlight a focus on innovation, internationalization, and sustainability.

Security posture

The website demonstrates a mature security posture with HTTPS enforcement and a GDPR-compliant cookie consent mechanism. The absence of exposed sensitive data and use of modern JavaScript libraries indicate good security hygiene. However, the lack of a publicly available security policy and incident response contact reduces transparency. No security.txt file or vulnerability disclosure program was found. Security headers are not explicitly detected, suggesting room for improvement. Overall, the security posture is strong but could benefit from enhanced documentation and header implementation to meet best practices fully.

Recommendations

  1. Publish a dedicated security policy page outlining security practices and commitments.
  2. Provide clear incident response contact information, such as security@ or abuse@ email addresses.
  3. Implement and enforce security headers like Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security.
  4. Establish and publicize a vulnerability disclosure program or security.txt file to encourage responsible reporting.
  5. Regularly audit third-party scripts and tracking pixels to ensure no vulnerabilities or privacy issues.

Contact details published on the site

Addresses
Legal name
United Internet AG
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
United Internet AG
Description
Die United Internet AG ist mit seinen Marken 1&1, GMX, WEB.DE, mail.com, IONOS, Arsys, Fasthosts, InterNetX, united-domains, Sedo und United Internet Media ein führender europäischer Internet-Spezialist.
Key services
Internet access, Cloud applications, Email services, Domain registration, Media services
Content quality
excellent
Branding
consistent

Technology

Stack
TYPO3 CMS, JavaScript, CSS, HTML5, Video HTML5 element
Frameworks
TYPO3 CMS
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent with opt-in
  • No exposed sensitive data in HTML
  • No visible vulnerable libraries

Analytics and tracking

Services
Adobe Analytics
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Adobe Analytics (AppMeasurement.min.js)
Transparency
basic

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenges.
  2. Content is comprehensive, professionally presented, and well-structured.
  3. Strong corporate branding with multiple subsidiary brands highlighted.
  4. Cookie consent mechanism is implemented with opt-in for analytics.
  5. Investor relations and stock information are prominently featured.
  6. No exposed sensitive data or obvious security vulnerabilities detected.
  7. Social media presence on LinkedIn, Twitter, and Xing is linked.
  8. No explicit security policy or incident response contact found publicly.
  9. WHOIS data supports legitimacy and consistency with business claims.
Technical notes

Notes

The website is built on TYPO3 CMS, a robust and widely used content management system. It uses modern web technologies including HTML5, CSS, and JavaScript, with asynchronous loading of analytics scripts to optimize performance. The site is mobile responsive and accessible, with clear navigation and structured content. Hosting appears stable with no signs of latency or downtime. The use of video content and SVG logos indicates a modern design approach. Some technical improvements could include enhanced security headers and further optimization for performance metrics.
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

Earlier scans of this domain

  1. 75/100Medium22 findingsView report
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