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The denial-of-service (DoS) exploit takes advantage of two features in HTTP/2 that were designed to save Internet bandwith, not power massive amplification attacks.
Codex drops an HTTP/2 Bomb
A new denial-of-service (DoS) attack dubbed HTTP/2 Bomb can be launched from a single machine to take down web servers within seconds. [...]
Cybersecurity researchers have discovered a remote denial-of-service exploit that affects major web servers, including NGINX, Apache HTTPD, Microsoft IIS, Envoy, and Cloudflare Pingora