HTTP/1.1 has a fatal desync flaw that allows attackers to smuggle requests through reverse proxies and CDNs, leading to mass site takeovers across millions of domains.
Advanced methods like 0.CL desyncs and Expect header manipulations evade existing defences and automated tools, resulting in high-impact vulnerabilities and significant bug bounty payouts.
The only reliable mitigation is to upgrade upstream connections to HTTP/2 and apply strict request validation, as patching individual HTTP/1.1 implementations will never eliminate the underlying risk.
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