FKIE_CVE-2019-9516
Vulnerability from fkie_nvd - Published: 2019-08-13 21:15 - Updated: 2026-06-17 02:43
Severity
Summary
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| apple | swiftnio | * | |
| apple | mac_os_x | * | |
| canonical | ubuntu_linux | * | |
| apache | traffic_server | * | |
| apache | traffic_server | * | |
| apache | traffic_server | * | |
| canonical | ubuntu_linux | 16.04 | |
| canonical | ubuntu_linux | 18.04 | |
| canonical | ubuntu_linux | 19.04 | |
| debian | debian_linux | 9.0 | |
| debian | debian_linux | 10.0 | |
| fedoraproject | fedora | 30 | |
| synology | skynas | - | |
| synology | diskstation_manager | 6.2 | |
| synology | vs960hd_firmware | - | |
| synology | vs960hd | - | |
| debian | debian_linux | 9.0 | |
| debian | debian_linux | 10.0 | |
| fedoraproject | fedora | 29 | |
| fedoraproject | fedora | 30 | |
| fedoraproject | fedora | 32 | |
| opensuse | leap | 15.0 | |
| opensuse | leap | 15.1 | |
| redhat | jboss_core_services | 1.0 | |
| redhat | jboss_enterprise_application_platform | 7.2.0 | |
| redhat | jboss_enterprise_application_platform | 7.3.0 | |
| redhat | openshift_service_mesh | 1.0 | |
| redhat | quay | 3.0.0 | |
| redhat | software_collections | 1.0 | |
| redhat | enterprise_linux | 8.0 | |
| oracle | graalvm | 19.2.0 | |
| mcafee | web_gateway | * | |
| mcafee | web_gateway | * | |
| mcafee | web_gateway | * | |
| f5 | nginx | * | |
| f5 | nginx | * | |
| nodejs | node.js | * | |
| nodejs | node.js | * | |
| nodejs | node.js | * |
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"value": "Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory."
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"value": "Algunas implementaciones de HTTP / 2 son vulnerables a una fuga de encabezado, lo que puede conducir a una denegaci\u00f3n de servicio. El atacante env\u00eda una secuencia de encabezados con un nombre de encabezado de longitud 0 y un valor de encabezado de longitud 0, opcionalmente Huffman codificado en encabezados de 1 byte o m\u00e1s. Algunas implementaciones asignan memoria para estos encabezados y mantienen viva la asignaci\u00f3n hasta que la sesi\u00f3n muere. Esto puede consumir un exceso de memoria."
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"id": "CVE-2019-9516",
"lastModified": "2026-06-17T02:43:53.023",
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/"
},
{
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"tags": [
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],
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},
{
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],
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},
{
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"tags": [
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],
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},
{
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],
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},
{
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"tags": [
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],
"url": "https://support.f5.com/csp/article/K02591030"
},
{
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},
{
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],
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},
{
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},
{
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],
"url": "https://www.synology.com/security/advisory/Synology_SA_19_33"
},
{
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],
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},
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],
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},
{
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{
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},
{
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{
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{
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"tags": [
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"url": "https://www.synology.com/security/advisory/Synology_SA_19_33"
}
],
"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"
}
]
}
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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.
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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.
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