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Fencer Intel
high 7.5

CVE-2019-9518 in the critical feed json

Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service

published 7y ago modified 4mo ago also EUVD-2019-18890

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
25.4%
EPSS 25.4% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

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.

Patch / fix

  • mcafee web_gateway 7.7.2.24, 7.8.2.13, 8.2.0
  • nodejs node.js 8.16.1, 10.16.3, 12.8.1
  • trafficserver Debian 12 8.0.5+ds-1

debian advisories DEBIAN-CVE-2019-9518

  • netty Ubuntu Pro 18.04 LTS 1:4.1.7-4ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2019-9518

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • npm RHEL 8 1:6.9.0-1.10.16.3.2.module+el8.0.0+4214+49953fda
  • nodejs RHEL 8 1:10.16.3-2.module+el8.0.0+4214+49953fda
  • nodejs-nodemon RHEL 8 1.18.3-1.module+el8+2632+6c5111ed
  • nodejs-packaging RHEL 8 17-3.module+el8+2873+aa7dfd9a
  • rh-nodejs8-nodejs RHEL 3 SOFTWARE_COLLECTIONS 8.16.1-2.el7
  • rh-nodejs8 RHEL 3 SOFTWARE_COLLECTIONS 3.0-5.el7
  • rh-nodejs8-npm RHEL 3 SOFTWARE_COLLECTIONS 6.4.1-8.16.1.2.el7
  • rh-nodejs8-runtime RHEL 3 SOFTWARE_COLLECTIONS 3.0-5.el7

red hat advisories RHSA-2019:2925RHSA-2019:2955RHSA-2019:2939

  • nodejs12 SLE Module for Web and Scripting 12 12.13.0-1.3.1
  • nodejs8 SLE Module for Web and Scripting 15 SP1, SLE Module for Web and Scripting 15 8.16.1-3.20.1
  • nodejs10 SLE Module for Web and Scripting 15 SP1, SLE Module for Web and Scripting 15, SLE Module for Web and Scripting 12 10.16.3-1.12.1
  • firefox-atk SLES 11 SP4-LTSS 2.26.1-2.8.4
  • mozilla-nss SLES 11 SP4-LTSS 3.45-38.9.3
  • firefox-gtk3 SLES 11 SP4-LTSS 3.10.9-2.15.3
  • mozilla-nspr SLES 11 SP4-LTSS 4.21-29.6.1
  • firefox-cairo SLES 11 SP4-LTSS 1.15.10-2.13.4

suse advisories SUSE-SU-2019:14246-1SUSE-SU-2020:0059-1SUSE-SU-2019:2260-1SUSE-SU-2019:2259-1SUSE-SU-2019:2254-1

  • nodejs8 openSUSE Leap 15.1, openSUSE Leap 15.0 8.16.1-lp151.2.6.1
  • nodejs10 openSUSE Leap 15.1, openSUSE Leap 15.0 10.16.3-lp151.2.6.1

opensuse advisories openSUSE-SU-2019:2115-1openSUSE-SU-2019:2114-1

  • nodejs-nodemon AlmaLinux 8 1.18.3-1.module_el8.3.0+2023+d2377ea3
  • nodejs-nodemon AlmaLinux 8 1.18.3-1.module_el8.3.0+2047+b07ac28e
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.4.0+2224+b07ac28e
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.4.0+2521+c668cc9f
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.3.0+2023+d2377ea3

almalinux advisories ALSA-2019:2925

  • nodejs-nodemon Rocky Linux 8 1.18.3-1.module+el8.3.0+101+f84c7154
  • nodejs-packaging Rocky Linux 8 17-3.module+el8.3.0+101+f84c7154

rocky linux advisories RLSA-2019:2925

  • nodejs Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 10.16.3-r0

alpine advisories ALPINE-CVE-2019-9518

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2019-9518 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-9518 updated cvss 7.5

HTTP/2: flood using empty frames results in excessive resource consumption

  • Red Hat AMQ Broker 7 jetty, netty netty
    affected: no fix available
  • Red Hat JBoss Enterprise Application Platform 7 undertow-core
    affected: no fix available “Fix deferred”
  • Red Hat JBoss Fuse 6 undertow undertow
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Application Runtimes netty netty, rhoar-nodejs rhoar-nodejs
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat AMQ
    fixed: vendor fix RHSA-2020:0922
  • Red Hat AMQ 7.4.3
    fixed: vendor fix RHSA-2020:1445
  • Red Hat Data Grid 7.3.3
    fixed: vendor fix RHSA-2020:0727
  • Red Hat Decision Manager 7
    fixed: vendor fix RHSA-2020:3196
show 7 more
  • Red Hat Enterprise Linux AppStream (v. 8) nodejs 10.16.3-2.module+el8.0.0+4214+49953fda, nodejs-packaging 17-3.module+el8+2873+aa7dfd9a, nodejs-nodemon 1.18.3-1.module+el8+2632+6c5111ed, npm 6.9.0-1.10.16.3.2.module+el8.0.0+4214+49953fda
    fixed: vendor fix RHSA-2019:2925
  • Red Hat Fuse 6.3
    fixed: vendor fix RHSA-2019:4352
  • Red Hat Fuse 7.5.0
    fixed: vendor fix RHSA-2019:3892
  • Red Hat Fuse 7.6.0
    fixed: vendor fix RHSA-2020:0983
  • Red Hat Process Automation 7
    fixed: vendor fix RHSA-2020:3197
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +4 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +4 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +4 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +4 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +4 more
    fixed: vendor fix RHSA-2019:2939
  • Red Hat CloudForms Management Engine 5 nginx, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, nginx-mod-http-perl, +3 more Red Hat OpenShift Service Mesh Tech Preview maistra Red Hat Ansible Tower 3 nginx Red Hat Enterprise Linux 8 nginx, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, nginx-mod-http-perl, +2 more Red Hat JBoss Data Grid 7 undertow undertow Red Hat JBoss Data Virtualization 6 netty netty
    +10 more products
    Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb Red Hat OpenShift Application Runtimes undertow undertow Red Hat OpenShift Container Platform 3.9 nodejs, atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, +9 more Red Hat OpenShift Container Platform 3.10 nodejs, atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, +8 more Red Hat OpenShift Container Platform 3.11 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +7 more Red Hat OpenShift Container Platform 4 openshift, openshift-clients, openshift-kubelet, openshift-hyperkube, openshift-kube-apiserver, openshift-kube-scheduler, +2 more Red Hat Process Automation 7 undertow undertow Red Hat Quay 3 nodejs Red Hat Single Sign-On 7 netty netty, undertow undertow Red Hat Software Collections rh-nginx110-nginx, rh-nginx112-nginx, rh-nginx114-nginx, rh-nginx110-nginx-mod-mail, rh-nginx112-nginx-mod-mail, rh-nginx114-nginx-mod-mail, +12 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

25.45% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.