HTTP/2: request for large response leads to denial of service

A vulnerability was found in HTTP/2. An attacker can open a HTTP/2 window so the peer can send without constraint. The TCP window remains closed so the peer cannot write the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the server's...

www/varnish7 -- Denial of Service

The Varnish Development Team reports: A denial of service attack can be performed on Varnish Cacher servers that have the HTTP/2 protocol turned on. An attacker can let the servers HTTP/2 connection control flow window run out of credits indefinitely and prevent progress in the processing of...