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CVE-2019-9518

Published: 13 August 2019

Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.

From the Ubuntu Security Team

It was discovered that Netty incorrectly implements HTTP/2. An attacker could possibly use this issue to cause a denial of service.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
netty
Launchpad, Ubuntu, Debian
kinetic Ignored
(end of life, was needed)
bionic
Released (1:4.1.7-4ubuntu0.1+esm1)
Available with Ubuntu Pro
disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Needed

trusty Not vulnerable
(code not preent)
upstream Needs triage

xenial Not vulnerable
(code not present)
groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needed

mantic Needed

lunar Ignored
(end of life, was needed)
trafficserver
Launchpad, Ubuntu, Debian
kinetic Ignored
(end of life, was needs-triage)
bionic Needs triage

focal Not vulnerable
(8.0.5+ds-3)
groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needs triage

trusty Does not exist

upstream Needs triage

xenial Needs triage

mantic Needs triage

lunar Ignored
(end of life, was needs-triage)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H