CVE-2019-9511 (GCVE-0-2019-9511)
Vulnerability from cvelistv5 – Published: 2019-08-13 20:50 – Updated: 2024-08-04 21:54
VLAI
EPSS
VEX
Title
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service
Summary
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
Severity
7.5 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
47 references
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"value": "Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both."
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{
"lang": "es",
"value": "Algunas implementaciones de HTTP / 2 son vulnerables a la manipulaci\u00f3n del tama\u00f1o de la ventana y la manipulaci\u00f3n de priorizaci\u00f3n de flujo, lo que puede conducir a una denegaci\u00f3n de servicio. El atacante solicita una gran cantidad de datos de un recurso especificado a trav\u00e9s de m\u00faltiples flujos. Manipulan el tama\u00f1o de la ventana y la prioridad de transmisi\u00f3n para obligar al servidor a poner en cola los datos en fragmentos de 1 byte. Dependiendo de cu\u00e1n eficientemente se pongan en cola estos datos, esto puede consumir un exceso de CPU, memoria o ambos."
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],
"id": "CVE-2019-9511",
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],
"sourceIdentifier": "cret@cert.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
}
],
"source": "cret@cert.org",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-10-12T13:53:13+00:00",
"cve": "CVE-2019-9511",
"id": "CVE-2019-9511",
"initial_release_date": "2019-08-13T00:00:00+00:00",
"product_status:fixed": "1600",
"product_status:known_affected": "8",
"product_status:known_not_affected": "98",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "HTTP/2: large amount of data requests leads to denial of service",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-9511.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "low",
"current_release_date": "2026-10-21T01:20:02Z",
"cve": "CVE-2019-9511",
"id": "CVE-2019-9511",
"initial_release_date": "2023-02-15T04:14:37Z",
"product_status:known_affected": "535",
"product_status:known_not_affected": "423",
"product_status:recommended": "749",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2019-9511",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2023/cve-2019-9511.json",
"version": "46"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.