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Security report for mastec.com

MasTec, Inc. · Energy · United States

Low risk. 2 critical or high findings in SSL/TLS and GDPR outside view.

Security score

83/100

Risk levelLow

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

MasTec, Inc. is a leading specialty contractor focused on engineering, designing, and constructing infrastructure projects primarily in the energy and telecommunications sectors. With a workforce of nearly 22,000 professionals and over 80 years of experience, MasTec holds a strong market position as a top infrastructure construction company in the United States. Their key services span civil infrastructure, communications, data centers, EV infrastructure, pipeline infrastructure, power delivery and generation, technology deployment, and water and wastewater solutions. The website reflects a professional corporate presence with comprehensive investor relations and sustainability reporting. Technically, the website employs modern front-end technologies including Bootstrap, Leaflet, Font Awesome, and Google Fonts. The site is mobile-optimized, accessible, and SEO-friendly, though performance is moderate. Security-wise, the site uses HTTPS and script integrity attributes but lacks visible security headers and explicit security or incident response policies. No vulnerabilities or malicious content were detected in the provided data. The WHOIS data is unavailable or protected, which introduces some uncertainty about domain registration details. However, the website's corporate content, investor relations, and contact information strongly support legitimacy. Privacy compliance is addressed with a clear privacy policy and cookie consent mechanism. Overall, the site demonstrates a mature digital presence suitable for an enterprise infrastructure contractor. Strategic recommendations include enhancing security posture by implementing security headers, publishing incident response and vulnerability disclosure policies, and verifying domain registration transparency to improve trustworthiness.

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

2 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

  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

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

Keep watching mastec.com

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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
74
Security headers
90
Email security
85
DNS health
80
Network security
100
GDPR outside view
68
Average
83

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

MasTec operates in the infrastructure construction sector with a focus on energy and telecommunications. Their business model centers on providing turnkey engineering, design, and construction services for large-scale infrastructure projects. The company targets utility companies, government agencies, and large enterprises requiring infrastructure development. Their investor relations presence and sustainability initiatives indicate a publicly traded enterprise with strong governance. The company leverages a broad service portfolio to maintain competitive advantage and growth. Partnerships and subsidiary domains support operational efficiency and employee engagement. Market positioning is strong given their extensive experience and workforce size, with growth potential in renewable energy and technology deployment sectors.

Security posture

The website demonstrates a moderate security maturity level. HTTPS is enabled, and script integrity attributes are used, indicating attention to secure content delivery. However, the absence of key security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options reduces defense-in-depth. No explicit security policies or incident response contacts are published, limiting transparency and readiness perception. No vulnerabilities or exposed sensitive data were detected in the HTML content. Privacy compliance is supported by a cookie consent banner and privacy policy. Overall, the security posture is adequate but could be improved by adopting best practices and publishing security governance documentation.

Recommendations

  1. Implement comprehensive HTTP security headers including CSP, HSTS, and X-Frame-Options to enhance protection against common web attacks.
  2. Publish a clear security policy and incident response plan on the website to improve transparency and preparedness.
  3. Add a vulnerability disclosure policy or security.txt file to facilitate responsible reporting of security issues.
  4. Regularly audit and update third-party libraries and scripts to mitigate risks from vulnerable dependencies.
  5. Review domain registration details and consider improving WHOIS transparency to strengthen trust and legitimacy.

Contact details published on the site

Addresses
Legal name
MasTec, Inc.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
MasTec, Inc.
Description
Leading specialty contractor engineers, designs and constructs infrastructures for electric power generation and transmission, oil and natural gas pipelines, renewable energy facilities and wireless networks.
Key services
Civil Infrastructure, Communications, Data Centers, EV Infrastructure, General Building, Industrial Solutions, Pipeline Infrastructure, Power Delivery, Power Generation, Technology Deployment
Content quality
excellent
Branding
consistent

Technology

Stack
Bootstrap, Leaflet, Font Awesome, Google Fonts
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
70/100
Good practices seen
  • Use of integrity attributes on scripts
  • Cookie consent banner

Analytics and tracking

Tracking level
minimal
Privacy practices
good

Advertising

Transparency
poor

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 navigation
  2. Strong corporate branding and investor relations presence
  3. No visible security headers or explicit security policies
  4. WHOIS data unavailable, possibly due to privacy or registry issues
  5. No suspicious or malicious content detected
  6. Cookie consent banner present indicating privacy awareness
  7. No contact form detected on homepage, but contact info present in footer
  8. No social media links explicitly found in provided HTML
Technical notes

Notes

The website uses a modern front-end technology stack with Bootstrap for responsive design, Leaflet for mapping features, Font Awesome for icons, and Google Fonts for typography. The site includes multiple custom JavaScript files with integrity attributes, indicating attention to script security. Performance is moderate, with preconnect hints for Google Fonts to improve loading. Accessibility features such as ARIA roles and labels are present, and the site is mobile-optimized. No CMS or hosting provider information is explicitly detected. The site structure is clear with well-organized navigation and semantic HTML. Opportunities exist to improve performance and security headers to reduce technical risks.
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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