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Security report for sktelecom.com

SK Telecom Co., Ltd. · Telecommunications · South Korea

Medium risk. 5 critical or high findings in Security headers and GDPR outside view.

Security score

67/100

Risk levelMedium

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

SK Telecom Co., Ltd. is a leading South Korean telecommunications company with a strong focus on AI infrastructure and services. The company positions itself as a global AI company, leveraging AI data centers, GPU cloud services, and edge AI technologies. The website reflects a mature enterprise with comprehensive investor relations, ESG management, and corporate information. Technically, the site uses a mix of legacy and modern JavaScript libraries, Google Tag Manager for analytics, and is well-optimized for mobile and accessibility. Security posture is good with HTTPS enforced, but lacks explicit security headers and visible incident response contacts. Privacy compliance is moderate with a clear privacy policy but no visible cookie consent mechanism. The domain WHOIS data is missing, which reduces transparency but the website content and branding strongly indicate legitimacy. Overall, the site is professional, trustworthy, and well-maintained.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 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

5 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 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 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 sktelecom.com

This scan found 24 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
85
Security headers
15
Email security
75
DNS health
75
Network security
100
GDPR outside view
53
Average
67

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

SK Telecom holds a dominant market position in South Korea's telecommunications sector, offering a broad range of services including mobile communications, AI B2C and B2B solutions, and AI infrastructure. The company maintains a robust ecosystem of subsidiaries and partners, enhancing its market reach and service diversity. The business model focuses on leveraging AI to drive innovation and growth, targeting both consumer and enterprise segments. The presence of detailed ESG and investor information signals strong corporate governance and transparency. The company’s digital presence supports its brand as a technology leader with a focus on sustainability and customer trust.

Security posture

The website demonstrates a good security baseline with enforced HTTPS and no visible exposure of sensitive data. However, the absence of explicit security headers such as Content Security Policy (CSP), HSTS, and X-Frame-Options is a gap that could be addressed to enhance protection against common web attacks. No vulnerability disclosure or incident response information is publicly available, which could hinder coordinated vulnerability management. The lack of a cookie consent mechanism may pose compliance risks in certain jurisdictions. Overall, the security posture is solid but could be improved with additional best practices and transparency.

Recommendations

  1. Implement and enforce security headers including CSP, HSTS, and X-Frame-Options to strengthen web security.
  2. Publish a clear vulnerability disclosure policy and provide incident response contact information to improve security transparency.
  3. Introduce a cookie consent banner or mechanism to comply with privacy regulations and enhance user trust.
  4. Regularly update and audit third-party libraries to mitigate risks from outdated components.
  5. Enhance privacy compliance by detailing data retention policies and user data handling practices.

Contact details published on the site

Addresses
Legal name
SK Telecom Co., Ltd.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
SK Telecom Co., Ltd.
Description
SK Telecom is a leading telecommunications company in South Korea focused on AI infrastructure, services, and global AI market leadership.
Key services
Mobile telecommunications, AI B2C and B2B services, AI infrastructure (GPU cloud, AI data centers), Customer support and digital services
Content quality
excellent
Branding
consistent

Technology

Stack
jQuery 1.12.2, Google Tag Manager, GSAP, Slick Carousel, UA-Parser, jQuery UI
Performance
moderate
Mobile
good
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of Google Tag Manager for analytics

Analytics and tracking

Services
Google Analytics (via Google Tag Manager)
Tracking level
moderate
Privacy practices
basic

Advertising

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 professional design.
  2. No WAF or blocking detected, allowing full analysis.
  3. WHOIS data is missing, limiting domain registration insights.
  4. Strong corporate branding and extensive investor and ESG information.
  5. No explicit cookie consent mechanism detected.
  6. No visible contact emails or phone numbers on main page; contact likely via subpages.
  7. Multiple external links to corporate subsidiaries and partner sites.
  8. Use of Google Tag Manager for analytics and tracking.
  9. Security headers not explicitly detected in provided data; HTTPS is enforced.
  10. No visible forms on main page; no data collection forms detected.
Technical notes

Notes

The website uses a combination of older and modern JavaScript libraries such as jQuery 1.12.2, GSAP for animations, and Slick Carousel for sliders. Google Tag Manager is used for analytics and tracking, indicating a mature digital marketing setup. The site is mobile responsive with good accessibility features including skip navigation links and ARIA roles. Performance is moderate, with some room for optimization. No CMS or hosting provider details are explicitly detected. The technical infrastructure supports a professional corporate website with dynamic content and interactive features.
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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