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Security report for zillow.com

Other · N/a

Medium risk. 7 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

73/100

Risk levelMedium

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

The website www.zillow.com is currently inaccessible due to a PerimeterX security challenge page that blocks access to the actual content. This prevents extraction of meaningful business, technical, or security information from the site. The domain WHOIS data is unavailable, showing no registrar or registrant details, which limits trust and legitimacy verification. The site uses advanced bot mitigation technology indicating a high-security posture but also restricting external analysis. Without access to the real content, no privacy, cookie, or contact policies can be confirmed. Overall, the site appears to be protected by strong security controls but lacks publicly accessible information for comprehensive evaluation.

Scanned

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

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

7 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 X-Frame-Options header

      Prevents clickjacking attacks

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

    • 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 zillow.com

This scan found 17 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
82
Security headers
50
Email security
87
DNS health
85
Network security
100
GDPR outside view
35
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

Technical appendix

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

Business context

Business profile

Due to the blocked content, no direct business intelligence can be gathered from the website. Zillow is a known real estate marketplace, but this analysis cannot confirm current market positioning, services, or partnerships from the site itself. The presence of PerimeterX suggests a focus on protecting business assets from automated abuse. No partner or subsidiary domains were identified beyond security-related domains. The lack of accessible contact or policy information limits assessment of customer engagement or compliance maturity.

Security posture

The site employs PerimeterX, a sophisticated bot mitigation and security solution, indicating a proactive security stance. However, no security headers or SSL configuration details are available for review. The absence of visible privacy or incident response policies and the inability to access the site content limit the security posture assessment. The use of hidden iframes from suspicious domains like 'crcldu.com' could be a concern but may be part of security or tracking mechanisms. Overall, the security posture appears strong in terms of access control but lacks transparency for external evaluation.

Recommendations

  1. Provide a publicly accessible version or staging environment for external security and compliance audits.
  2. Publish clear privacy, cookie, and terms of service policies accessible without security challenges.
  3. Ensure WHOIS data is available or provide verified domain registration information to improve trust.
  4. Implement and expose security headers and SSL configuration details for transparency.
  5. Review and document third-party domains used, especially hidden iframes, to ensure no suspicious activity.
Site observations

Automated reading of the public site. Ratings are indicative.

Generic detected. Page is a security challenge (PerimeterX captcha) blocking access to the actual website content. These observations may be incomplete. For a fuller analysis, contact guard@offseq.com.

Business

Content quality
poor

Technology

Stack
PerimeterX, Roboto font, JavaScript

Analytics and tracking

Site quality

Design
poor
User experience
poor
Content relevance
poor
Navigation
poor
Professionalism
poor
Trustworthiness
low

Key observations

  1. Website content is blocked by PerimeterX security challenge (captcha)
  2. No actual website content accessible for analysis
  3. No metadata, forms, or contact information found
  4. No privacy, cookie, or terms of service policies detected
  5. No security headers or SSL information available
  6. External domains mostly related to security and font resources
  7. Presence of suspicious external domain 'crcldu.com' used in hidden iframe
  8. WHOIS data unavailable, indicating privacy or data protection
  9. Overall analysis limited due to access restrictions
Technical notes

Notes

The website uses PerimeterX for bot mitigation and Google Fonts for typography. No CMS or hosting provider information is discernible. The site is heavily protected, resulting in no accessible HTML content beyond the security challenge. Performance, accessibility, and SEO cannot be evaluated. The presence of multiple scripts related to captcha and security indicates a modern security-focused tech stack but limits content delivery and user experience for external visitors.
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. 74/100 −4Medium25 findingsView report
  2. 78/100Low19 findingsView report
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