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. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

How to fix CVE-2019-9511

To remediate CVE-2019-9511, upgrade the affected package to a fixed version below.

—upgrade to 1.39.2-r0 or later
—upgrade to 1.16.1-r0 or later
—upgrade to 10.16.3-r0 or later
—upgrade to 1.18.1-1+deb9u1 or later
—upgrade to 1.39.2-1 or later
—upgrade to 1.14.2-3 or later
—upgrade to 1.10.3-1+deb9u3 or later
—upgrade to 10.16.3~dfsg-1 or later

Is CVE-2019-9511 being exploited?

Moderate — EPSS is 13.7%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (8)

from 0, < 1.39.2-r0
from 0, < 1.16.1-r0
from 0, < 10.16.3-r0
from 0, < 1.18.1-1+deb9u1
from 0, < 1.39.2-1
from 0, < 1.14.2-3
from 0, < 1.10.3-1+deb9u3
from 0, < 10.16.3~dfsg-1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H