CVE-2025-8671 Information

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). 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. This allows a client to cause the server to handle an unbounded number of concurrent streams on a single connection. This CVE will be updated as affected product details are released.

Reference

https://galbarnahum.com/made-you-reset https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80 https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq https://gitlab.isc.org/isc-projects/bind9/-/issues/5325 https://kb.cert.org/vuls/id/767506 https://support2.windriver.com/index.php?page=security-notices https://varnish-cache.org/security/VSV00017.html https://www.fastlystatus.com/incident/377810 https://www.suse.com/support/kb/doc/?id=000021980 https://gitlab.isc.org/isc-projects/bind9/-/issues/5325

Related CNNVD

CNNVD-202508-1338 (Published: 2025-08-13)