Overview A vulnerability has been discovered within many HTTP/2 implementations allowing for denial of service (DoS) attacks through HTTP/2 control frames. This vulnerability is colloquially known as "MadeYouReset" and is tracked as CVE-2025-8671. Some vendors have assigned a specific CVE to their products to describe the vulnerability. MadeYouReset exploits a mismatch caused by stream resets between HTTP/2 specifications and the internal architectures of many real-world web servers. This results in resource exhaustion, and a threat actor can leverage this vulnerability to perform a distributed denial of service attack (DDoS). This vulnerability is similar to CVE-2023-44487, colloquially known as "Rapid Reset." Multiple vendors have issued patches or responses to the vulnerability, and readers should review the statements provided by vendors at the end of this Vulnerability Note and patch as appropriate. Description 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 denial-of-service (DoS). This vulnerability is tracked as CVE-2025-8671 and is known colloquially as "MadeYouReset." This vulnerability is similar to CVE-2023-44487, colloquially known as "Rapid Reset", which abused client-sent stream resets. HTTP/2 introduced stream cancellation – the ability of both client and server to immediately close a…Read More