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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 offers a suite of encrypted services including email, calendar, cloud storage, password management, and VPN, targeting privacy-conscious users globally. Proton VPN is recognized for its no-logs policy, open-source applications, and strong encryption standards, positioning it as a top-tier VPN provider with a robust market presence and excellent user trust. The website demonstrates a mature technical infrastructure leveraging modern frameworks like Astro and React, hosted via Cloudflare for performance and security. Security posture is strong with HTTPS enforcement, advanced encryption protocols, and features like kill switch and DNS filtering. However, explicit incident response and vulnerability disclosure policies are not prominently published, representing an area for improvement. Overall, Proton VPN's digital presence reflects a professional, secure, and privacy-compliant service with high trustworthiness and excellent user experience.

Scanned

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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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 comprehensive product ecosystem and freemium subscription model. The company targets individuals and businesses seeking secure communications and internet freedom. Its competitive advantages include open-source transparency, independent audits, and a strict no-logs policy. Revenue streams primarily come from paid VPN subscriptions and premium tiers of other Proton services. The partnership ecosystem includes related privacy tools like Simple Login and Standard Notes, enhancing user retention and cross-service integration. Growth indicators include multi-language support, global server infrastructure, and continuous feature innovation such as VPN Accelerator and Stealth protocol. Strategic observations highlight Proton's commitment to privacy and security as core differentiators in a crowded VPN market.

Security posture

Proton VPN exhibits a high security maturity level with enforced HTTPS, strong encryption algorithms (AES-256, ChaCha20), and secure VPN protocols (WireGuard, OpenVPN). The presence of features like kill switch and DNS filtering enhances user data protection. The company is based in Switzerland, benefiting from strong privacy laws, and maintains a strict no-logs policy. However, the absence of a publicly accessible incident response plan or security.txt file limits transparency in vulnerability management. No critical vulnerabilities or exposed sensitive data were detected in the website content. Compliance with GDPR is implied through privacy policies and data protection practices. Overall, Proton VPN maintains a robust security culture but could improve incident response communication.

Recommendations

  1. Publish a dedicated incident response and vulnerability disclosure policy to enhance transparency and user trust.
  2. Implement and publicly link a security.txt file to facilitate responsible vulnerability reporting.
  3. Regularly update and communicate certifications or independent audit results to reinforce security assurances.
  4. Enhance contact information with dedicated security and abuse email addresses for prompt incident handling.
  5. Continue investing in performance optimization and accessibility improvements to maintain excellent user experience.

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
Proton VPN, Proton Mail, Proton Calendar, Proton Drive, Proton Pass, Proton Wallet, Proton Authenticator, Simple Login, Lumo AI
Content quality
excellent
Branding
consistent

Technology

Stack
React, Astro framework, Cloudflare DNS, YouTube embedded video, Modern CSS with Tailwind-like utility classes
Frameworks
Astro, React
Platforms
Windows, macOS, Linux, Android, iOS
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)
  • DNS filtering (NetShield) for ad and malware blocking

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 multimedia.
  2. Strong emphasis on privacy, security, and transparency.
  3. Multiple language support and global server presence.
  4. Clear calls to action and easy navigation.
  5. No signs of suspicious or malicious content.
Technical notes

Notes

The website is built on modern web technologies including the Astro framework and React components, ensuring modularity and performance. Hosting via Cloudflare provides CDN and DNS security benefits. The site is mobile-optimized with responsive design and accessibility considerations. SEO is well-implemented with comprehensive meta tags, Open Graph, and JSON-LD structured data. The use of modern encryption protocols and VPN-specific features like VPN Accelerator indicates a technically advanced backend infrastructure. No technical debt or deprecated technologies were detected. Opportunities exist to further enhance security posture by integrating automated security headers and incident response tooling.
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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