waf-bypass-techniques

To bypass a WAF, you must first fingerprint the firewall to identify its type, then apply generic evasion techniques like encoding normalization gaps, HTTP parameter pollution, and path normalization to slip injection payloads through the filter.

HTTP request smuggling is an evasion technique that exploits HTTP/1.1 transfer quirks or HTTP/2 framing differences. You should pivot to request smuggling when generic encoding and parameter pollution approaches fail to bypass the target WAF.

You can identify a WAF through behavioral fingerprinting by analyzing response headers and server behaviors to validate detection. This repeatable fingerprinting workflow helps determine the likely WAF type before selecting bypass tactics.

The best generic evasion techniques include encoding normalization gaps, HTTP parameter pollution, content-type manipulation, chunking, and keyword splitting. A structured decision tree helps systematically iterate through these options for SQLi and XSS payloads.

WAF fingerprinting applies across common scenarios including HTTP/1.1 transfer quirks and HTTP/2 framing differences. Validating detection using response and header behaviors helps identify parsing disparities across these protocol versions.

Your WAF bypass stops working when generic encoding evasion fails against vendor-specific logic. When this happens, you should follow the decision tree to pivot to request smuggling or switch to product-specific tactics using a vendor matrix.