FKIE_CVE-2025-8671
Vulnerability from fkie_nvd - Published: 2025-08-13 13:15 - Updated: 2025-11-04 22:16
Severity ?
Summary
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"cveTags": [],
"descriptions": [
{
"lang": "en",
"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\u2014using malformed frames or flow control errors\u2014an 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."
},
{
"lang": "es",
"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 denegaci\u00f3n de servicio (DoS). Al abrir flujos y luego activar r\u00e1pidamente 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 contin\u00fae. Esto permite que un cliente haga que el servidor gestione un n\u00famero ilimitado de flujos simult\u00e1neos en una sola conexi\u00f3n. Esta CVE se actualizar\u00e1 a medida que se publiquen los detalles de los productos afectados."
}
],
"id": "CVE-2025-8671",
"lastModified": "2025-11-04T22:16:44.813",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
},
"published": "2025-08-13T13:15:34.790",
"references": [
{
"source": "cret@cert.org",
"url": "https://galbarnahum.com/made-you-reset"
},
{
"source": "cret@cert.org",
"url": "https://github.com/h2o/h2o/commit/4729b661e3c6654198d2cc62997e1af58bef4b80"
},
{
"source": "cret@cert.org",
"url": "https://github.com/h2o/h2o/security/advisories/GHSA-mrjm-qq9m-9mjq"
},
{
"source": "cret@cert.org",
"url": "https://gitlab.isc.org/isc-projects/bind9/-/issues/5325"
},
{
"source": "cret@cert.org",
"url": "https://kb.cert.org/vuls/id/767506"
},
{
"source": "cret@cert.org",
"url": "https://support2.windriver.com/index.php?page=security-notices"
},
{
"source": "cret@cert.org",
"url": "https://varnish-cache.org/security/VSV00017.html"
},
{
"source": "cret@cert.org",
"url": "https://www.fastlystatus.com/incident/377810"
},
{
"source": "cret@cert.org",
"url": "https://www.suse.com/support/kb/doc/?id=000021980"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2025/08/13/6"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2025/09/18/1"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://deepness-lab.org/publications/madeyoureset/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://github.com/Kong/kong/discussions/14731"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://github.com/envoyproxy/envoy/issues/40739"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://github.com/varnish/hitch/issues/397"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://www.imperva.com/blog/madeyoureset-turning-http-2-server-against-itself/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://www.kb.cert.org/vuls/id/767506"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"url": "https://gitlab.isc.org/isc-projects/bind9/-/issues/5325"
}
],
"sourceIdentifier": "cret@cert.org",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-404"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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