CVE-2019-9517

Description

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

How to fix CVE-2019-9517

To remediate CVE-2019-9517, upgrade the affected package to a fixed version below.

• —upgrade to 2.4.41-r0 or later
• —upgrade to 10.16.3-r0 or later
• —upgrade to 2.4.41-1 or later

Is CVE-2019-9517 being exploited?

Low — EPSS is 4.6%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 2.4.41-r0
• from 0, < 10.16.3-r0
• from 0, < 2.4.41-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2019-9517
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2019-9517