{"api_version":"1","generated_at":"2026-04-23T00:39:43+00:00","cve":"CVE-2019-9511","urls":{"html":"https://cve.report/CVE-2019-9511","api":"https://cve.report/api/cve/CVE-2019-9511.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2019-9511","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-9511"},"summary":{"title":"CVE-2019-9511","description":"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. 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service"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"credit":[{"lang":"eng","value":"Thanks to Jonathan Looney of Netflix for reporting this vulnerability."}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","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."}]},"generator":{"engine":"Vulnogram 0.0.7"},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.0"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-400 Uncontrolled Resource 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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.","Type":"Description","Title":null},{"CveYear":"2019","CveId":"9511","Ordinal":"2","NoteData":"2019-08-13","Type":"Other","Title":"Published"},{"CveYear":"2019","CveId":"9511","Ordinal":"3","NoteData":"2021-01-20","Type":"Other","Title":"Modified"}]}}}