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Security report for delekus.com

Delek US Holdings, Inc. · Energy · United States

Low risk. 4 critical or high findings in SSL/TLS, GDPR outside view and 1 other check.

Security score

78/100

Risk levelLow

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

Delek US Holdings, Inc. is a large, diversified downstream energy company operating primarily in petroleum refining, asphalt, renewable fuels, and logistics. The company operates multiple refineries in the United States with a significant crude oil refining capacity and is publicly traded on the NYSE. The website demonstrates a mature digital presence with comprehensive corporate, investor, and social responsibility content, supported by a modern technology stack including Q4 Inc's investor relations platform and multimedia integrations. Security posture is generally good with HTTPS and cookie consent mechanisms in place, though explicit security headers and incident response contacts are not evident. The absence of WHOIS data is a notable anomaly that slightly reduces trust but does not outweigh the professional presentation and Fortune 500 status. Overall, the website is well-designed, accessible, and trustworthy for its target audiences including investors, employees, and partners.

Scanned

NIS2 and GDPR posture

GDPR outside view
68/ 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. 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
    • 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

  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. 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

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

Keep watching delekus.com

This scan found 16 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
57
Security headers
65
Email security
85
DNS health
90
Network security
100
GDPR outside view
68
Average
78

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

The company holds a strong market position as a Fortune 500 energy enterprise with diversified operations spanning refining, commercial trading, logistics, and energy transition initiatives. Its business model focuses on downstream energy products and services, targeting institutional investors, industry analysts, suppliers, and community stakeholders. The presence of dedicated subdomains for investor relations and careers indicates a structured approach to stakeholder engagement. Partnerships and subsidiaries such as Delek Logistics support its operational footprint. The website content and navigation reflect a strategic emphasis on transparency, sustainability, and innovation, positioning Delek US Holdings as a forward-looking energy company.

Security posture

The website employs HTTPS and a cookie consent mechanism, indicating baseline security and privacy compliance. However, the lack of visible security headers such as Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security suggests room for improvement in hardening the web infrastructure. No explicit incident response or abuse contact information is provided, which is a gap in security transparency. The use of third-party tracking via Q4 Tracker is disclosed through cookie consent, aligning with privacy best practices. No vulnerabilities or exposed sensitive data were detected in the HTML content. Overall, the security maturity is moderate with recommendations to enhance header configurations and incident response visibility.

Recommendations

  1. Implement comprehensive HTTP security headers including Content-Security-Policy, X-Frame-Options, and Strict-Transport-Security to improve defense against common web attacks.
  2. Publish a dedicated security or incident response policy page with clear contact channels for reporting vulnerabilities or abuse.
  3. Verify and update WHOIS registration information to ensure transparency and domain legitimacy.
  4. Enhance contact information availability on the website, including verified company emails and phone numbers for customer and security inquiries.
  5. Regularly audit third-party scripts and tracking tools to ensure compliance with evolving privacy regulations and minimize user tracking.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Delek US Holdings, Inc.
Description
Delek US Holdings, Inc. is a diversified downstream energy company specializing in petroleum refining, asphalt, renewable fuels, and logistics. Refining operations are located in Texas, Arkansas, and Louisiana with a combined crude throughput capacity of 302,000 barrels per day. The company emphasizes safe, reliable energy and cleaner, innovative solutions, with a strong commitment to employees and communities.
Key services
petroleum refining, asphalt production, renewable fuels, logistics services, commercial crude and product trading, energy transition innovation
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, jQuery, Splide.js (carousel), Vimeo embedded video, Google Fonts, Typekit fonts, Q4 Inc investor relations platform
Frameworks
ASP.NET Web Forms
Platforms
Q4 Inc IR platform
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent banner implemented
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Q4 Tracker
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
Q4 Tracker
Marketing tools
Q4 Blizzard, Q4 Tracker
Transparency
basic

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 corporate branding and investor relations focus.
  3. Comprehensive navigation with detailed business and social responsibility sections.
  4. Cookie consent and privacy policy implemented with high confidence.
  5. No visible contact emails or phone numbers on the overview page.
  6. No explicit security or incident response contact information found.
  7. WHOIS data unavailable, which is unusual for a Fortune 500 company domain.
  8. Use of Q4 Inc platform for investor relations and tracking.
  9. No signs of adult or questionable content.
Technical notes

Notes

The website is built on ASP.NET Web Forms technology integrated with Q4 Inc's investor relations platform, leveraging modern JavaScript libraries such as jQuery and Splide.js for UI components. It uses multiple web font providers including Google Fonts and Adobe Typekit for typography. Multimedia content is embedded via Vimeo. The site demonstrates good mobile responsiveness and accessibility features. Performance is moderate, with potential optimization opportunities in script loading and asset delivery. The CMS appears custom or proprietary to Q4 Inc, which may limit flexibility but ensures investor relations functionality. Overall, the technical infrastructure supports a professional corporate web presence with scope for modernization and security enhancements.
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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