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Glossary Term

Origin Server Exposure

When attackers can bypass a CDN or WAF and reach the origin server directly.

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Origin Server Exposure

1-minute read

What it is

Origin server exposure happens when attackers can bypass your CDN/WAF and reach the real "origin" (your actual web server) directly - typically via leaked IPs, misconfigured DNS, or unprotected alternate hostnames.

Why it matters

If attackers can hit the origin directly, they can dodge firewall rules, DDoS protections, and caching layers. That increases the risk of downtime, brute-force attempts, and exploitation of unpatched services.

How to reduce risk

  • Restrict origin access to only your CDN/WAF IP ranges (firewall allowlist)
  • Remove or lock down "hidden" hostnames and old DNS records
  • Use mTLS or signed origin pulls if supported by your provider
  • Regularly scan for exposed origin IPs and unexpected open ports