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Security report for etherscan.io

Privacy service provided by Withheld for Privacy ehf · Technology · Iceland

Medium risk. 8 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

68/100

Risk levelMedium

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

The website etherscan.io is currently inaccessible due to a Cloudflare Turnstile security challenge page, which blocks direct content access. Etherscan.io is a well-known blockchain explorer service primarily serving the Ethereum ecosystem, providing users with transaction tracking, smart contract verification, and blockchain analytics. The domain is mature, created in 2015, and uses privacy protection for WHOIS data, which is common in the blockchain industry to protect registrant privacy. The technical infrastructure includes Cloudflare's security services, indicating a strong perimeter defense. However, due to the blocking, no direct content, policies, or contact information could be extracted or analyzed. The security posture at the network edge is strong, but internal security and compliance details are not visible. Overall, the site appears legitimate and professionally managed but requires bypassing the WAF challenge for full analysis.

Scanned

NIS2 and GDPR posture

GDPR outside view
35/ 100 · High
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

8 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
    • 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 Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • 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

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

Keep watching etherscan.io

This scan found 21 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
57
Security headers
55
Email security
80
DNS health
80
Network security
100
GDPR outside view
35
Average
68

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

Etherscan.io operates in the technology sector, specifically blockchain analytics and Ethereum ecosystem services. The business model likely revolves around providing free and premium blockchain data services to developers, investors, and enterprises. The domain age and registrar information support a stable market presence. The use of privacy protection is justified given the sensitive nature of blockchain data services. No direct business contact or partnership domains were found in the provided content. The company likely targets blockchain developers, crypto traders, and institutional clients. The lack of visible marketing or advertising tools suggests a focus on organic traffic and service reliability.

Security posture

The presence of Cloudflare Turnstile captcha and WAF indicates a proactive security posture against automated attacks and abuse. No security headers or internal security policies were visible due to content blocking. No exposed sensitive data or vulnerabilities were detected in the accessible content. The domain uses HTTPS as implied by Cloudflare usage, but SSL configuration details are unavailable. Incident response and vulnerability disclosure information are not publicly visible. Overall, perimeter security is strong, but internal security maturity cannot be assessed from the blocked content.

Recommendations

  1. Provide publicly accessible privacy and cookie policies to improve transparency and compliance.
  2. Publish clear contact information and security incident response contacts to enhance trust.
  3. Implement security.txt file for vulnerability disclosure and security communication.
  4. Ensure SEO and accessibility features are optimized once WAF challenge is passed.
  5. Consider reducing WAF challenge friction for legitimate users to improve user experience.
Site observations

Automated reading of the public site. Ratings are indicative.

Cloudflare detected. Page is a Cloudflare security challenge page with Turnstile captcha verifying human access. These observations may be incomplete. For a fuller analysis, contact guard@offseq.com.

Business

Company
Privacy service provided by Withheld for Privacy ehf

Technology

Stack
Cloudflare Turnstile, Cloudflare WAF, JavaScript

Analytics and tracking

Site quality

Trustworthiness
low

Key observations

  1. Website content is currently blocked by Cloudflare Turnstile security challenge.
  2. No visible business or contact information on the page due to blocking.
  3. No privacy, cookie, or terms of service policies detected in the provided HTML.
  4. No forms or data collection fields visible except hidden captcha response inputs.
  5. External links only to Cloudflare domains related to security challenge.
  6. No social media or email contacts found in the HTML content.
  7. WHOIS data shows privacy protection and domain age consistent with legitimate business.
  8. Website is protected by Cloudflare WAF with Turnstile captcha, indicating strong security posture at perimeter.
  9. Unable to assess actual website content, SEO, or user experience due to blocking.
Technical notes

Notes

The website is protected by Cloudflare's security platform, including Turnstile captcha for bot mitigation. The HTML content is minimal and serves only as a challenge page, with no visible CMS or frameworks detected. Hosting is via Cloudflare, providing CDN and security services. Performance and mobile optimization cannot be assessed due to blocking. No analytics or marketing scripts were detected in the challenge page. The technical stack is modern at the perimeter but internal technical details are unavailable. The site uses standard web technologies including HTML5, CSS, and JavaScript.
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. 71/100Medium27 findingsView report
  2. 71/100Medium28 findingsView report
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