CVE-2019-9515

high-risk

Published 2019-08-13

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.

Do I need to act?

9.0% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (20)

Swiftnio

Traffic Server

Ubuntu Linux

Debian Linux

Skynas

Diskstation Manager

Vs960Hd Firmware

Fedora

Leap

Jboss Core Services

Jboss Enterprise Application Platform

Openshift Container Platform

Openshift Service Mesh

Openstack

Affected Vendors

Debian Redhat Apache Apple Oracle F5 Mcafee Canonical Fedoraproject Opensuse Synology Nodejs

References (76)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html

Mailing List http://seclists.org/fulldisclosure/2019/Aug/16

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2766

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2796

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2861

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2925

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2939

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2955

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:3892

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:4018

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:4019

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:4020

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:4021

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:4040

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:4041

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:4042

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:4045

Third Party Advisory https://access.redhat.com/errata/RHSA-2019:4352

Third Party Advisory https://access.redhat.com/errata/RHSA-2020:0727

and 56 more references

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high-risk

Severity 26/34 · High

Exploitability 10/34 · Low

Exposure 22/34 · High