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Security report for 1und1.de

1&1 Telecommunication SE · Telecommunication · DE

Medium risk. 4 critical or high findings in GDPR outside view and Security headers.

Security score

73/100

Risk levelMedium

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

The website demonstrates a generally strong technical security foundation in network security, email security, SSL/TLS, and DNS health, scoring above 80% in these areas. However, critical deficiencies exist in GDPR compliance and adherence to the NIS2 cybersecurity directive, with scores below 30%, posing significant legal and operational risks. Key issues include lack of adequate privacy measures for EU users, absence of cookie policies and consent mechanisms, missing security policies, and incident response plans. Security headers are partially implemented but contain weaknesses that could expose the site to clickjacking and cross-site scripting attacks. These gaps could lead to regulatory penalties, reputational damage, and increased vulnerability to cyber incidents. Immediate remediation is necessary to align with compliance requirements and strengthen defensive controls. Addressing these will reduce legal exposure and enhance customer trust and resilience against threats.

Scanned

This is an earlier scan of 1und1.de. View the latest report

NIS2 and GDPR posture

GDPR outside view
18/ 100 · Critical
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

4 findings rated critical or high. Fix these first.

  1. GDPR outside view

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

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  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 X-Frame-Options header

      Prevents clickjacking attacks

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

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

Keep watching 1und1.de

This scan found 16 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
85
Security headers
65
Email security
85
DNS health
85
Network security
100
GDPR outside view
18
Average
73

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 1und1.de, from OffSeq Breach.

Total records
856,753
Employees
56
Customers
288,162
Third parties
568,535
Weak passwords
25%

Latest record dated 2026-06-05 · 274 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for 1und1.de.

Select it in the checkout above.

Masked preview

  • –www.1und1.de2026-06-05
  • –www.1und1.de2026-06-02
  • –www.1und1.de2026-06-01
  • –1und1.de2026-05-29
  • –imap.1und1.de2026-05-29

Breach keeps ingesting new leaks, so these numbers can grow between scans.

Open in Breach(opens in a new tab)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.

Technical notes

Notes

The most critical findings include a 'Critical' GDPR issue where the EU business lacks adequate privacy measures, exposing the company to severe regulatory penalties under GDPR. High-severity NIS2 deficiencies include absence of an information security framework, security policy documentation, incident response procedures, and security contact information, which undermines the organization's ability to respond to and manage cybersecurity incidents effectively. Missing the X-Frame-Options header at high severity allows attackers to perform clickjacking attacks, potentially compromising user interactions. Medium severity issues such as missing Permissions-Policy header and mixed content can lead to security misconfigurations and data exposure. The lack of DKIM records increases email spoofing risk, while DNSSEC absence exposes DNS to cache poisoning attacks. Collectively, these vulnerabilities highlight significant compliance and security control gaps requiring urgent remediation.
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. 79/100Low25 findingsView report
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