CDN Tsunami Attack Abuses HTTP/3 Translation for Up to 350x DoS Amplification

Cybersecurity researchers have disclosed two denial-of-service (DoS) attacks that exploit how major content delivery networks (CDNs) convert client-facing HTTP/3 traffic into HTTP/1.1 requests to the websites they front, amplifying a low-bandwidth request stream by up to 350x against the origin server.

The attacks, collectively named "CDN Tsunami," were evaluated against Alibaba, Baidu,

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id: 2643
uid: xftdV
insdate: 2026-08-20 14:10:24
title: CDN Tsunami Attack Abuses HTTP/3 Translation for Up to 350x DoS Amplification
additional: Cybersecurity researchers have disclosed two denial-of-service (DoS) attacks that exploit how major content delivery networks (CDNs) convert client-facing HTTP/3 traffic into HTTP/1.1 requests to the websites they front, amplifying a low-bandwidth request stream by up to 350x against the origin server.

The attacks, collectively named "CDN Tsunami," were evaluated against Alibaba, Baidu,
category: Cybersecurity
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