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Security report for zalo.me

Zalo Group · Technology · Vietnam

Low risk. 3 critical or high findings in Security headers and GDPR outside view.

Security score

77/100

Risk levelLow

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

Zalo Group operates a leading Vietnamese communication platform offering Zalo PC software for Windows and Mac OS, along with business services such as Official Accounts and developer APIs. The website is professionally designed, targeting general users and business teams in Vietnam, providing fast file sharing and chat synchronization features. The technical infrastructure includes modern JavaScript libraries and analytics tools, with moderate performance and good mobile optimization. Security posture is adequate with HTTPS and cookie consent mechanisms, though improvements are recommended in DNSSEC, security headers, and explicit security policies. The domain registration uses privacy protection but aligns with the business profile and age. Overall, the site is trustworthy and compliant with basic privacy standards.

Scanned

NIS2 and GDPR posture

GDPR outside view
65/ 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

3 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"

  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

      Third-party services without privacy policy

      Detected services: Google Analytics

      What to do: Document all third-party data sharing in your privacy policy

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

Keep watching zalo.me

This scan found 18 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

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

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Full report

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Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

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
100
Security headers
40
Email security
75
DNS health
80
Network security
100
GDPR outside view
65
Average
77

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

Zalo Group holds a strong market position in Vietnam's technology and telecommunications sector, offering free communication software with additional business-oriented services. Their business model leverages software downloads and platform services for enterprises. The company demonstrates consistent branding and trust signals, supported by a mature digital presence and partnerships within its ecosystem. Growth is indicated by diversified offerings and active user engagement through multiple platforms.

Security posture

The website employs standard security practices such as HTTPS and cookie consent but lacks advanced security headers and published incident response or vulnerability disclosure policies. No critical vulnerabilities or exposed sensitive data were detected. The absence of DNSSEC and security policy documentation suggests room for maturity improvement. Incident response readiness and security culture indicators are not publicly visible, which could be enhanced to strengthen trust and compliance.

Recommendations

  1. Enable DNSSEC on the domain to improve DNS security.
  2. Publish a dedicated security policy and incident response contact information.
  3. Implement and publicize a vulnerability disclosure program or security.txt file.
  4. Add security headers such as Content Security Policy, HSTS, and X-Frame-Options.
  5. Enhance accessibility features and provide clearer contact information for users.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Zalo Group
Description
Ứng dụng Zalo PC cho máy tính với các tính năng như gửi file 1GB, chụp màn hình, phân loại nhóm, đồng bộ tin nhắn với điện thoại, tối ưu cho chat nhóm và trao đổi công việc.
Key services
Zalo PC application for Windows and Mac OS, Official Account platform for businesses, Developer API services
Content quality
good
Branding
consistent

Technology

Stack
jQuery, Bootstrap, Swiper, Google Analytics, Google Tag Manager, adtima conversion tracking, session-sdk
Platforms
Windows, Mac OS, Web
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
70/100
Good practices seen
  • Cookie consent banner with accept/deny options
  • No exposed sensitive data in HTML
  • Use of clientTransferProhibited domain status

Analytics and tracking

Services
Google Analytics, Google Tag Manager, Zalo Analytics
Tracking level
moderate
Privacy practices
basic

Advertising

Ad networks
adtima
Tracking pixels
Zalo Analytics (za.js)
Marketing tools
adtima conversion tracking
Transparency
basic

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 professional and targeted at Vietnamese users for Zalo PC software.
  3. Clear presence of privacy and terms policies though no explicit security or incident response policies.
  4. No direct company contact emails or phone numbers found on this page.
  5. Use of multiple external analytics and marketing scripts.
  6. Cookie consent mechanism implemented with accept and deny options.
  7. Domain WHOIS uses privacy protection but is consistent with business profile.
  8. No suspicious or malicious indicators detected.
Technical notes

Notes

The website uses a modern tech stack including jQuery, Bootstrap, and Swiper for UI, along with Google Analytics and Tag Manager for tracking. The infrastructure supports Windows, Mac OS, and web platforms. Performance is moderate with room for optimization. No CMS detected, likely custom or proprietary hosting. The site is mobile optimized with responsive design but accessibility is basic. Technical risks include lack of DNSSEC and missing security headers, which could be addressed to reduce attack surface and improve compliance.
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. 77/100Low27 findingsView report
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