CVE-2019-9511

Public on 2019-09-30
Modified on 2019-10-30
Description
A flaw was found in HTTP/2. An attacker can request a large amount of data by manipulating 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 queue can consume excess CPU, memory, or both, leading to a denial of service. The highest threat from this vulnerability is to system availability.
Severity
Important
CVSS v3 Base Score
6.5
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 mod_http2 2019-10-28 17:43 ALAS2-2019-1342
Amazon Linux 2 nghttp2 2019-10-08 21:43 ALAS2-2019-1298
Amazon Linux 1 nghttp2 2019-09-30 21:03 ALAS-2019-1298
Amazon Linux 1 nginx 2019-09-30 21:06 ALAS-2019-1299

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 6.5 CVSS:3.0/AV:N/AC:L/PR:L/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