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Security report for protonvpn.com

Proton AG · Technology · Switzerland

Medium risk. 4 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

Proton AG operates Proton VPN, a leading privacy-focused VPN service developed by scientists from CERN and MIT. The company is headquartered in Switzerland, leveraging the country's strong privacy laws to offer secure, no-logs VPN services. Proton VPN is part of a broader suite of privacy tools including encrypted email, calendar, cloud storage, and password management, targeting privacy-conscious users globally. The business model is freemium, with a free tier and premium subscription plans offering enhanced features. Proton VPN enjoys a strong market position, supported by positive expert reviews and a loyal community. Technically, the website employs modern frameworks such as Astro and React, is hosted via Cloudflare, and is optimized for performance and mobile devices. Security posture is robust, with HTTPS, strong encryption protocols, and open-source audited software. No critical vulnerabilities or suspicious indicators were found. Overall, Proton VPN demonstrates a mature, trustworthy, and privacy-respecting digital presence.

Scanned

This is an earlier scan of protonvpn.com. View the latest report

NIS2 and GDPR posture

GDPR outside view
53/ 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

4 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 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';…

  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

    • 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

  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 protonvpn.com

This scan found 18 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

Email alerts on material changes and an exportable JSON history of every change.

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Full report

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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
72
Security headers
65
Email security
72
DNS health
90
Network security
100
GDPR outside view
53
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

Technical appendix

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

Business context

Business profile

Proton AG's market positioning as a privacy-first technology company is reinforced by its Swiss base and transparent no-logs policy. The company benefits from a diversified product portfolio that includes VPN, encrypted email, and cloud services, appealing to both individual and business customers. Revenue streams primarily come from subscription plans. The company maintains a strong partnership ecosystem, including its parent domain proton.me and presence on major app stores. Growth indicators include extensive platform support and positive community engagement. Strategic observations highlight Proton's emphasis on open-source transparency and compliance with privacy regulations as competitive advantages.

Security posture

Proton VPN exhibits a high security maturity level with enforced HTTPS, comprehensive security headers, and use of strong encryption standards like AES-256 and ChaCha20. The VPN supports secure protocols such as WireGuard and OpenVPN, and includes features like kill switch and always-on VPN to protect user data. The company is transparent about its no-logs policy and undergoes independent audits. However, the absence of a published security.txt and explicit incident response contact details are minor gaps. Compliance with GDPR is indicated through privacy policies and cookie consent mechanisms. Overall, Proton VPN maintains a strong security culture and readiness.

Recommendations

  1. Enable DNSSEC on the domain to enhance DNS security and prevent spoofing.
  2. Publish a security.txt file to facilitate responsible vulnerability disclosure.
  3. Provide explicit incident response and abuse contact information on the website.
  4. Regularly update and publicly document compliance with emerging regulations like NIS2.
  5. Enhance user education on security features and incident reporting procedures.

Contact details published on the site

Addresses
Legal name
Proton AG
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Proton AG
Description
Proton provides easy-to-use encrypted email, calendar, cloud storage, password manager, and VPN services, built on the principle of your data, your rules.
Key services
VPN service, Encrypted email, Calendar, Cloud storage, Password manager, Bitcoin wallet
Content quality
excellent
Branding
consistent

Technology

Stack
React, Astro framework, Cloudflare DNS, JavaScript ES Modules
Frameworks
Astro, React
Platforms
Windows, macOS, Linux, Android, iOS, Chrome, Firefox
Performance
fast
Mobile
excellent
Accessibility
good
SEO
excellent

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • No logs policy
  • Kill switch and always-on VPN features
  • Use of strong encryption protocols (AES-256, ChaCha20, WireGuard, OpenVPN)
  • Open-source and audited software

Analytics and tracking

Tracking level
minimal
Privacy practices
excellent

Advertising

Transparency
excellent

Site quality

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

Key observations

  1. Website is fully accessible with rich content and no blocking.
  2. Strong emphasis on privacy, security, and transparency.
  3. Multiple language support and extensive platform coverage.
  4. Clear business and product information with strong trust signals.
  5. No suspicious or malicious indicators detected.
Technical notes

Notes

The website is built using modern web technologies including Astro and React, ensuring modularity and performance. Hosting via Cloudflare provides CDN and security benefits. The site is well-optimized for mobile devices and accessibility, with comprehensive SEO metadata and structured data (JSON-LD). The use of Strapi CMS is inferred from media URLs, indicating a headless CMS approach. Performance is fast with preloading and CDN usage for assets. Technical risks are minimal, though enabling DNSSEC and publishing security.txt would further strengthen infrastructure. Overall, the technical implementation supports a robust 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

Earlier scans of this domain

  1. 75/100 −3Medium25 findingsView report
  2. 78/100Low21 findingsView report
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