CVEvulnerability
CVE-2025-8671
7.5 HIGH
Official page ↗
- Status
- Deferred
- Published
- 2025-08-13
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-404
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.
Related
Weakness · CWE (1)
- CWE-404 Improper Resource Shutdown or Release weakness
References
- https://galbarnahum.com/made-you-reset galbarnahum.com
- https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80 github.com
- https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq github.com
- https://gitlab.isc.org/isc-projects/bind9/-/issues/5325 gitlab.isc.org
- https://kb.cert.org/vuls/id/767506 kb.cert.org
- https://support2.windriver.com/index.php?page=security-notices support2.windriver.com
- https://varnish-cache.org/security/VSV00017.html varnish-cache.org
- https://www.fastlystatus.com/incident/377810 www.fastlystatus.com
- https://www.suse.com/support/kb/doc/?id=000021980 www.suse.com
- http://www.openwall.com/lists/oss-security/2025/08/13/6 www.openwall.com
- http://www.openwall.com/lists/oss-security/2025/09/18/1 www.openwall.com
- https://deepness-lab.org/publications/madeyoureset/ deepness-lab.org
- https://github.com/Kong/kong/discussions/14731 github.com
- https://github.com/envoyproxy/envoy/issues/40739 github.com
- https://github.com/varnish/hitch/issues/397 github.com
- https://www.imperva.com/blog/madeyoureset-turning-http-2-server-against-itself/ www.imperva.com
- https://www.kb.cert.org/vuls/id/767506 www.kb.cert.org
- https://gitlab.isc.org/isc-projects/bind9/-/issues/5325 gitlab.isc.org