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Updated at The higher the score, the more externally observable protections the system has recorded. This page does not certify that the website is reputable, legitimate, or completely free of vulnerabilities.
As of September 17, 2026 at 16:09, cdn.jsdelivr.net has a security score of 86.9/100 (grade B: “Good”). CyStack’s automated assessment recorded 7 issues to review after completing 98% of applicable checks. The website owner should address “Supported TLS versions” first, then review the remaining items in order of impact.
At assessment time, CyStack did not find cdn.jsdelivr.net or related infrastructure on any scam, phishing, or malware warning list after checking 5 online reputation sources. This result reflects external observations; it does not guarantee absolute safety or verify the organization’s legal status or reputation.
Addresses, servers and services that are visible from the Internet.
Frequently asked questions
A valid SSL certificate still does not prove that cdn.jsdelivr.net is safe, legitimate, or free of scam signals. For a more complete assessment, this report also checks phishing and malware, exposed email records, IPs and open ports, subdomains, technologies, and CVEs that may apply to observed versions.
cdn.jsdelivr.net used a valid SSL certificate at assessment time, valid until December 5, 2026. This status may change when the certificate expires or the server configuration changes.
Review HTTPS and certificateData sources
CyStack compiles scan results from its internal cybersecurity monitoring systems, including CyStack VulnScan and CyStack Threat Intelligence, together with publicly available Internet data. The assessment only observes and analyzes information already available; it does not attempt unauthorized access, test passwords, send exploit code, or change or disrupt the assessed system.
CyStack VulnScan continuously discovers assets, validates vulnerabilities, and helps security teams prioritize remediation across the enterprise.
These 3 failed checks or warnings have the greatest impact on the result for cdn.jsdelivr.net.
Why it matters
TLS 1.0 and TLS 1.1 use outdated security designs and are no longer accepted by modern standards. Leaving them enabled allows older, weaker connection methods.
What to do
Disable TLS 1.0 and TLS 1.1, support TLS 1.2 securely, and enable TLS 1.3 where possible.
Evidence and check scope
References
Each public IP is grouped with its open services, identified products and any CVEs that may apply to the observed version.
151.101.1.229
Varnish Cache151.101.65.229151.101.129.229151.101.193.2292a04:4e42::4852a04:4e42:200::4852a04:4e42:400::4852a04:4e42:600::485Evidence and check scope
References
Evidence and check scope
References
HSTS
HTTP/3Varnish CacheVarnish CacheVarnish CacheRecently completed assessments, prioritizing websites with a similar sector, country or security grade for easier comparison.
