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Security report for sennheiser.com

Sennheiser · Technology · Germany

Medium risk. 3 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

75/100

Risk levelMedium

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

Sennheiser is a globally recognized leader in the audio technology industry, specializing in the design and manufacture of high-quality headphones, microphones, and wireless systems. With a legacy spanning over 75 years, the company serves a diverse audience including professional audio users, consumers, and businesses requiring advanced audio solutions. The website reflects a mature digital presence with comprehensive product information, support resources, and a global dealer network. Technically, the site leverages modern frameworks such as Next.js and React, ensuring good performance and mobile optimization. Security posture is strong with HTTPS enforcement and appropriate security headers, although explicit security policies and vulnerability disclosure mechanisms are not publicly detailed. Overall, the site demonstrates high professionalism and trustworthiness, supporting Sennheiser's market position as a premium audio brand.

Scanned

NIS2 and GDPR posture

GDPR outside view
73/ 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

3 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 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

  2. GDPR outside view

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

    • 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

  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 SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching sennheiser.com

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.

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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
65
Security headers
50
Email security
75
DNS health
85
Network security
100
GDPR outside view
73
Average
75

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 sennheiser.com, from OffSeq Breach.

Total records
1,307
Employees
7
Customers
1,216
Third parties
84
Weak passwords
17%

Latest record dated 2026-06-14 · 54 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 sennheiser.com.

Select it in the checkout above.

Masked preview

  • –adfs.sennheiser.com2026-06-14
  • –adfs.sennheiser.com2026-05-28
  • –adfs.sennheiser.com2026-03-27
  • –adfs.sennheiser.com2026-03-26
  • –adfs.sennheiser.com2025-07-05

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.

Business context

Business profile

Sennheiser operates primarily in the technology sector, focusing on audio equipment manufacturing and sales. The company maintains a large-scale operation with subsidiaries such as Georg Neumann GmbH, enhancing its product portfolio. Its business model includes direct sales, partnerships, and extensive customer support. The website's multilingual and multi-market structure indicates a broad international reach. The presence of dedicated portals for sales and support, along with a newsroom and career pages, suggests a well-organized corporate structure. Strategic partnerships and a strong social media presence further reinforce its competitive advantage and brand visibility.

Security posture

The website exhibits a mature security posture with enforced HTTPS, comprehensive security headers, and consent management for privacy compliance. No critical vulnerabilities or exposed sensitive data were detected in the analysis. However, the absence of a publicly accessible security policy or incident response contact limits transparency. The site would benefit from publishing a vulnerability disclosure policy or security.txt file to enhance trust and facilitate responsible reporting. Overall, the security measures align well with industry best practices for a commercial technology website.

Recommendations

  1. Publish a dedicated security policy and incident response information page to improve transparency.
  2. Implement and publicize a vulnerability disclosure program or security.txt file.
  3. Provide clear contact information for the Data Protection Officer or privacy contact.
  4. Regularly review and update third-party scripts and dependencies to mitigate potential vulnerabilities.
  5. Enhance data retention policy disclosures related to analytics and user data.

Contact details published on the site

Addresses
Legal name
Sennheiser electronic SE & Co. KG
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Sennheiser
Description
Shaping the future. Whether on stage, in concert halls, in the studio, or on broadcast, Sennheiser stands for unparalleled sound quality and utmost reliability. We develop the future of audio technology and create sound experiences. We measure our success by the goosebumps we give you.
Key services
Audio product manufacturing, Customer support and service, Product downloads and instructions, Dealer and partner network
Content quality
excellent
Branding
consistent

Technology

Stack
React, Next.js, JavaScript, CSS, Usercentrics (consent management), Optimizely (A/B testing)
Frameworks
Next.js
Performance
moderate
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Security headers present
  • No exposed sensitive data in HTML
  • Consent management implemented

Analytics and tracking

Services
Google Tag Manager, Optimizely
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Optimizely
Tracking pixels
Usercentrics
Marketing tools
Optimizely, Usercentrics
Transparency
good

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 challenge
  2. Content is rich, professional, and well-structured
  3. Strong presence of privacy and cookie policies with consent management
  4. Comprehensive contact information including phone numbers and addresses
  5. Use of modern web technologies and frameworks
  6. No security or privacy critical issues detected
  7. WHOIS data unavailable, which is unusual but not necessarily suspicious given the brand
Technical notes

Notes

The website is built on a modern technology stack including React and Next.js, enabling server-side rendering and improved SEO. It uses Usercentrics for consent management and Optimizely for A/B testing, indicating a focus on user experience optimization and compliance. The site is well-structured with comprehensive metadata, Open Graph tags, and JSON-LD structured data for SEO and social media integration. Performance is moderate with good mobile optimization and accessibility features. No CMS was explicitly detected, suggesting a custom or headless CMS solution. Hosting provider details are not disclosed. The technical implementation supports a professional and scalable online presence.
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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