CVE-2019-9515

Description

Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. The attacker sends a stream of SETTINGS frames to the peer. Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalent in behavior to a ping. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

How to fix CVE-2019-9515

To remediate CVE-2019-9515, upgrade the affected package to a fixed version below.

• —upgrade to 10.16.3-r0 or later
• —upgrade to 2.2.5+dfsg2-3 or later
• —upgrade to 8.0.5+ds-1 or later

Is CVE-2019-9515 being exploited?

Likely — EPSS is 87.8%, placing CVE-2019-9515 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.

Affected packages (3)

• from 0, < 10.16.3-r0
• from 0, < 2.2.5+dfsg2-3
• from 0, < 8.0.5+ds-1

CVSS scores

References (2)

• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2019-9515
• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2019-9515