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CVE-2019-9517

Public on 2019-08-13
Modified on 2019-10-30
Description

A vulnerability was found in HTTP/2. An attacker can open a HTTP/2 window so the peer can send without constraint. The TCP window remains closed so the peer cannot write the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the server's queue is setup, the responses can consume excess memory, CPU, or both, potentially leading to a denial of service. The highest threat from this vulnerability is to system availability.

Severity
Important
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CVSS v3 Base Score
7.5
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 httpd24 2019-10-18 23:22 ALAS-2019-1311
Amazon Linux 2 - Core mod_http2 2019-10-28 17:43 ALAS2-2019-1342

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv3 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv2 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C