en
404 Not Found
IndustryOriginGlobal rankRank in Vietnam
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 12, 2026 at 03:04, www.ued.udn.vn has a security score of 59/100 (grade F – “Low”). CyStack’s automated assessment recorded 13 issues to review after completing 95.9% of applicable checks. The website owner should address “Certificate matches the website” first, then review the remaining items in order of impact.
At assessment time, CyStack did not find www.ued.udn.vn 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 www.ued.udn.vn 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.
HTTPS on www.ued.udn.vn presented a certificate that was invalid or failed verification. The operator should review its validity dates, domain names, and trust chain.
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 www.ued.udn.vn.
Why it matters
The certificate must list the exact hostname visitors requested in its Subject Alternative Names (SAN). A mismatch produces browser warnings because the certificate may belong to a different service.
What to do
Issue and deploy a certificate whose SAN list includes every public hostname served by this website address.
Diagnostic information
The available certificate evidence was not sufficient to conclude this certificate requirement.
Evidence and check scope
Why it matters
Browsers trust a website only when its certificate can be traced to a recognized certificate provider. An untrusted certificate causes warnings and prevents visitors from reliably confirming the website's identity.
What to do
Install a certificate from a provider trusted by common browsers and configure the server to send every required intermediate certificate.
Why it matters
Content Security Policy (CSP) limits where scripts, styles, frames, and other browser content may come from. A strong policy reduces the impact if an attacker manages to inject content into a page.
What to do
Define only the sources the application needs, test the policy before activating it, and avoid broad wildcard (*) rules, unsafe-inline, and unsafe-eval where possible.
Each public IP is grouped with its open services, identified products and any CVEs that may apply to the observed version.
171.251.51.198
HSTSN
NginxO
OpenRestyNo record associated with an @udn.vn email address was found in the currently available data. This does not rule out incidents that have not been observed.
The assessment identified 7 technologies on www.ued.udn.vn, but no version was reliable enough for accurate CVE matching.
Review technologies and CVEsThe assessment observed 1 public IPs and 2 open ports for www.ued.udn.vn. An open port is not the same as a vulnerability, but the website owner should keep every public service updated and appropriately restrict access.
Review IPs and open portsThe assessment observed 523+ public subdomains of udn.vn. This list can reveal additional entry points such as APIs, administration systems, or test environments, but it does not mean that every subdomain is risky.
Review discovered subdomainsDiagnostic information
The available certificate evidence was not sufficient to conclude this certificate requirement.
Evidence and check scope
Scope of this check
This check only evaluates the homepage response and content that the scanner could reach. Other pages and sign-in flows may use different settings.
Evidence and check scope
References
HSTSSecurityVersion not visibleHTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
www.rfc-editor.org/rfc/rfc6797#section-6.1NginxReverse Proxies · Web ServersVersion not visibleNginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
nginx.org/enOpenRestyWeb ServersVersion not visibleOpenResty is a web platform based on nginx which can run Lua scripts using its LuaJIT engine.
openresty.orgHSTSNNginxOOpenRestyHSTSSecurityVersion not visibleHTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
www.rfc-editor.org/rfc/rfc6797#section-6.1NginxReverse Proxies · Web ServersVersion not visibleNginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
nginx.org/enOpenRestyWeb ServersVersion not visibleOpenResty is a web platform based on nginx which can run Lua scripts using its LuaJIT engine.
openresty.orgRecently completed assessments, prioritizing websites with a similar sector, country or security grade for easier comparison.
Vietnam
