CVE-2025-8671

Varnish Cache (affected versions not specified) Apache Tomcat (affected versions not specified) Netty (affected versions not specified) F5 BIG-IP (affected versions not specified) Fastly (affected versions not specified) gRPC (affected versions not specified) Mozilla (affected versions not specified) Suse Linux (affected versions not specified) Wind River (affected versions not specified) Zephyr Project (affected versions not specified) H2O (affected versions not specified) IBM (affected versions not specified) Jetty (affected versions not specified)

A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption, leading to a denial-of-service (DoS). By opening streams and then rapidly triggering the server to reset them—using malformed frames or flow control errors—an attacker can exploit incorrect stream accounting. Streams reset by the server are considered closed at the protocol level, even though backend processing continues, allowing a client to cause the server to handle an unbounded number of concurrent streams on a single connection. This vulnerability, also known as “MadeYouReset” (CVE-2025-8671), bypasses existing Rapid Reset mitigations. Approximately 99.6K+ services are potentially affected yearly.

At the moment, there is no information about a newer version that contains a fix for this vulnerability.