HTTP Request Smuggling

High Severity Technical Guide

Vulnerability Description

HTTP Request Smuggling is an attack where an attacker tampers with requests sent to a chain of proxies or load balancers, causing different servers to interpret message boundaries differently.

Remediation Guide

To resolve this vulnerability, follow these config changes or developer practices:

Ensure front-end and back-end web servers use identical HTTP parsing configurations. Prioritize HTTP/2 or HTTP/3 where request boundaries are strictly defined.

Verify Your Fix

After applying the remediation, run an external attack-surface scan to verify that the vulnerability is no longer detected by WebScanify.

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