Cloudflare Profile
Find out how the presence of Cloudflare is fingerprinted, associated security risks, and recommended configurations.
Software Profile
What is Cloudflare?
Cloudflare is a web infrastructure and website security company, providing content delivery network services, DDoS mitigation, Internet security, and distributed domain name server services.
Security and Vulnerability Footprint
Cloudflare acts as a protective shield. However, if origin server IPs are leaked or bypassable (direct access to hosting provider without going through Cloudflare), threat actors can route around WAF protections entirely.
Defensive Best Practices
Whitelist only Cloudflare IP ranges in your origin server's firewall (e.g. security group rules in AWS/GCP). Implement authenticated origin pulls using SSL certificates to verify traffic passes through Cloudflare.
Frequently Asked Questions
How do you detect Cloudflare usage on a domain?
Cloudflare is identified by DNS resolver lookup resolving to Cloudflare IPs, and HTTP headers like 'CF-Ray', 'cf-cache-status', and 'Server: cloudflare'.
What is an origin bypass vulnerability?
It is an architecture error where a server protected by Cloudflare allows direct connections to its origin IP, allowing attackers to bypass all WAF protections.
How does Cloudflare protect against DDoS attacks?
By acting as a reverse proxy, Cloudflare absorbs massive traffic spikes across its global edge network, filtering malicious botnets before they hit origin web servers.