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Security report for onegas.com

ONE Gas · Energy · United States

Medium risk. 3 critical or high findings in SSL/TLS and Security headers.

Security score

75/100

Risk levelMedium

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

ONE Gas is a large, publicly traded natural gas distribution company serving over 2.3 million customers across Kansas, Oklahoma, and Texas. It operates through three main divisions: Kansas Gas Service, Oklahoma Natural Gas, and Texas Gas Service. The company is headquartered in Tulsa, Oklahoma, and holds a strong market position as the largest natural gas distributor in Kansas and Oklahoma and the third largest in Texas. The website provides comprehensive investor relations, corporate governance, and customer service information, reflecting a mature and professional business presence. Technically, the website is built on ASP.NET WebForms with modern JavaScript libraries and integrates Google Analytics and OneTrust for privacy compliance. The site is mobile optimized, accessible, and uses HTTPS with a Content Security Policy, indicating a solid digital infrastructure. However, some security headers could be enhanced for improved protection. From a security perspective, the site demonstrates good practices including HTTPS enforcement and cookie consent mechanisms. No critical vulnerabilities or exposed sensitive data were detected. The absence of WHOIS data is a concern but likely due to privacy protection or technical reasons, not necessarily indicating malicious intent. Overall, the security posture is strong but could benefit from publishing incident response and vulnerability disclosure policies. The overall risk assessment is moderate to low, with the main recommendation being to improve transparency around domain registration and enhance security headers. The website is trustworthy, professionally maintained, and compliant with privacy regulations, making it a reliable source for customers and investors alike.

Scanned

NIS2 and GDPR posture

GDPR outside view
88/ 100 · Low
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

3 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. 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 onegas.com

This scan found 20 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
52
Security headers
65
Email security
70
DNS health
75
Network security
100
GDPR outside view
88
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

ONE Gas operates in the regulated energy sector, focusing on natural gas distribution. Its competitive advantage lies in its scale and market leadership in three states. The business model is based on regulated utility services, providing stable revenue streams from residential, commercial, industrial, and wholesale customers. The company targets investors, customers in its service areas, and stakeholders interested in corporate responsibility and governance. Growth indicators include active investor relations and sustainability reporting. The partnership ecosystem includes its three subsidiaries and career site. The company maintains a consistent brand and professional online presence, supporting its market position.

Security posture

The website exhibits a mature security posture with HTTPS enabled and a Content Security Policy in place. Cookie consent and privacy compliance are well implemented. No critical vulnerabilities or exposed sensitive data were found. However, additional security headers such as Strict-Transport-Security and X-Frame-Options are recommended. The lack of a public security policy or incident response information is a gap. The missing WHOIS data reduces transparency but does not directly impact security. Overall, the site is secure for users and business operations but could improve transparency and header coverage.

Recommendations

  1. Implement additional security headers including Strict-Transport-Security, X-Frame-Options, and X-Content-Type-Options.
  2. Publish a security policy and incident response plan on the website to improve transparency and trust.
  3. Create and publish a security.txt file to facilitate vulnerability disclosure.
  4. Investigate and resolve the missing WHOIS data to enhance domain registration transparency.
  5. Continue monitoring third-party scripts and tracking tools to ensure no vulnerabilities or privacy issues arise.

Contact details published on the site

Addresses
Legal name
ONE Gas, Inc.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
ONE Gas
Description
ONE Gas provides natural gas distribution services to more than 2.3 million customers in Kansas, Oklahoma and Texas. Headquartered in Tulsa, Oklahoma, its divisions include Kansas Gas Service, Oklahoma Natural Gas, and Texas Gas Service. It serves residential, commercial, industrial, transportation and wholesale customers.
Key services
Natural gas distribution, Investor relations, Customer service
Content quality
good
Branding
consistent

Technology

Stack
ASP.NET WebForms, jQuery, Slick Carousel, Google Analytics, OneTrust Cookie Consent, Cloudflare (likely CDN)
Frameworks
ASP.NET
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Content Security Policy implemented
  • Cookie consent mechanism present

Analytics and tracking

Services
Google Analytics, Google Tag Manager
Tracking level
moderate
Privacy practices
good

Advertising

Tracking pixels
OneTrust
Marketing tools
Pendo, Bugherd
Transparency
good

Site quality

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

Key observations

  1. Website is fully accessible with no blocking or WAF challenge.
  2. Content is professionally presented and relevant to natural gas utility business.
  3. Strong investor relations and corporate governance information present.
  4. Cookie consent and privacy compliance mechanisms implemented.
  5. WHOIS data is missing, which reduces trust but website content is consistent with a legitimate business.
  6. No suspicious or malicious content detected.
  7. Multiple external domains linked are subsidiaries or partners.
  8. Security headers present but could be improved.
  9. No visible vulnerabilities or exposed sensitive data.
Technical notes

Notes

The website is built on a legacy ASP.NET WebForms platform enhanced with modern JavaScript libraries such as jQuery and Slick Carousel. It uses Google Analytics and OneTrust for analytics and privacy compliance. Hosting appears to leverage Cloudflare CDN for performance and security. The site is mobile optimized and accessible with good SEO practices. Performance is moderate, with opportunities to modernize the tech stack for improved speed and maintainability. No technical debt or critical risks were identified, but modernization could reduce future risks and improve user experience.
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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