CVE-2019-9516 (GCVE-0-2019-9516)
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 a header leak, potentially leading to a denial of service
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.
Severity
7.5 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
37 references
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"datePublished": "2019-08-13T20:50:59.000Z",
"dateReserved": "2019-03-01T00:00:00.000Z",
"dateUpdated": "2024-08-04T21:54:44.285Z",
"state": "PUBLISHED"
},
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"date": "2026-09-16",
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"percentile": "0.98998"
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"descriptions": "[{\"lang\": \"en\", \"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.\"}, {\"lang\": \"es\", \"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.\"}]",
"id": "CVE-2019-9516",
"lastModified": "2024-11-21T04:51:47.107",
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"published": "2019-08-13T21:15:12.583",
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"sourceIdentifier": "cret@cert.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"cret@cert.org\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-400\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-770\"}]}]"
},
"microsoft_vex": {
"current_release_date": "2020-11-11T00:00:00.000Z",
"cve": "CVE-2019-9516",
"id": "msrc_CVE-2019-9516",
"initial_release_date": "2019-08-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "Some HTTP/2 implementations are vulnerable to a header leak potentially leading to a denial of service",
"url": "https://msrc.microsoft.com/csaf/vex/2019/msrc_cve-2019-9516.json",
"version": "1"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2019-9516\",\"sourceIdentifier\":\"cret@cert.org\",\"published\":\"2019-08-13T21:15:12.583\",\"lastModified\":\"2025-01-14T19:29:55.853\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"},{\"lang\":\"es\",\"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 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Advisory\"]},{\"url\":\"https://www.debian.org/security/2019/dsa-4505\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.synology.com/security/advisory/Synology_SA_19_33\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-08-08T16:25:17+00:00",
"cve": "CVE-2019-9516",
"id": "CVE-2019-9516",
"initial_release_date": "2019-08-13T00:00:00+00:00",
"product_status:fixed": "891",
"product_status:known_affected": "5",
"product_status:known_not_affected": "116",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "HTTP/2: 0-length headers lead to denial of service",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-9516.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "low",
"current_release_date": "2026-09-03T00:54:39Z",
"cve": "CVE-2019-9516",
"id": "CVE-2019-9516",
"initial_release_date": "2023-02-15T04:14:35Z",
"product_status:known_affected": "111",
"product_status:known_not_affected": "126",
"product_status:recommended": "503",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2019-9516",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2019-9516.json",
"version": "20"
}
}
}
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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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