CVE-2025-8671
Estado: AplazadaAlta (7.5)—
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.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 3.68%
- Percentil entre todas las CVEs puntuadas: 89
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access95 % - Impacto principal
T1499.004Application or System Exploitationimpact90 %
AV:N/PR:N/UI:N indica explotación remota sin privilegios (T1190). HTTP/2 flood con resets provoca consumo excesivo de recursos del servidor (T1499.004 - application exhaustion).
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
CWE
- CWE-404
Referencias
- 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
- http://www.openwall.com/lists/oss-security/2025/08/13/6
- http://www.openwall.com/lists/oss-security/2025/09/18/1
- https://deepness-lab.org/publications/madeyoureset/
- https://github.com/Kong/kong/discussions/14731
- https://github.com/envoyproxy/envoy/issues/40739
- https://github.com/varnish/hitch/issues/397
- https://www.imperva.com/blog/madeyoureset-turning-http-2-server-against-itself/
- https://www.kb.cert.org/vuls/id/767506
- https://gitlab.isc.org/isc-projects/bind9/-/issues/5325
JSON original (NVD)
Mostrar
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"value": "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."
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"value": "Una discrepancia causada por el restablecimiento de flujos enviados por el servidor, activados por el cliente, entre las especificaciones HTTP/2 y las arquitecturas internas de algunas implementaciones de HTTP/2 puede resultar en un consumo excesivo de recursos del servidor, lo que resulta en una denegación de servicio (DoS). Al abrir flujos y luego activar rápidamente el servidor para que los restablezca (mediante tramas malformadas o errores de control de flujo), un atacante puede explotar la contabilidad incorrecta de los flujos. Los flujos restablecidos por el servidor se consideran cerrados a nivel de protocolo, aunque el procesamiento del backend continúe. Esto permite que un cliente haga que el servidor gestione un número ilimitado de flujos simultáneos en una sola conexión. Esta CVE se actualizará a medida que se publiquen los detalles de los productos afectados."
}
],
"lastModified": "2026-06-17T10:07:24.987",
"sourceIdentifier": "cret@cert.org"
}