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 2019-08-13 7 y ago modified 2026-06-17 4 mo 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
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 nettyaffected: no fix available
-
Red Hat JBoss Enterprise Application Platform 7 undertow-coreaffected: no fix available “Fix deferred”
-
Red Hat JBoss Fuse 6 undertow undertowaffected: no fix planned “Out of support scope”
-
Red Hat OpenShift Application Runtimes netty netty, rhoar-nodejs rhoar-nodejsaffected: no fix available, no fix planned “Out of support scope”
-
Red Hat AMQfixed: vendor fix RHSA-2020:0922
-
Red Hat AMQ 7.4.3fixed: vendor fix RHSA-2020:1445
-
Red Hat Data Grid 7.3.3fixed: vendor fix RHSA-2020:0727
-
Red Hat Decision Manager 7fixed: vendor fix RHSA-2020:3196
show 7 moreshow fewer
-
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+49953fdafixed: vendor fix RHSA-2019:2925
-
Red Hat Fuse 6.3fixed: vendor fix RHSA-2019:4352
-
Red Hat Fuse 7.5.0fixed: vendor fix RHSA-2019:3892
-
Red Hat Fuse 7.6.0fixed: vendor fix RHSA-2020:0983
-
Red Hat Process Automation 7fixed: 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 morefixed: 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 nettynot affected: vulnerable code not present
+10 more productsfewer
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
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, 2026-11-08).
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
- Technology feeds
References
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/
vendor-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/
vendor-advisory
-
debian.org
/security/2019/dsa-4520
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2019-09/msg00032.html
vendor-advisory, mailing-list, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2019-09/msg00031.html
vendor-advisory, mailing-list, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:2925
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:2939
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:2955
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:3892
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:4352
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2020:0727
vendor-advisory, third-party-advisory
-
kb.cert.org
/vuls/id/605641/
third-party-advisory, us-government-resource
-
github.com
/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
third-party-advisory
-
seclists.org
/bugtraq/2019/Aug/24
mailing-list, third-party-advisory
-
seclists.org
/fulldisclosure/2019/Aug/16
mailing-list, third-party-advisory
-
synology.com
/security/advisory/Synology_SA_19_33
third-party-advisory
-
support.f5.com
/csp/article/K46011592
third-party-advisory
-
lists.apache.org
/thread.html/2653c56545573b528f3f6352a29eccaf498bd6fb2a6a59568d81a61d%40%3Cannounce.trafficserver.apache.org%3
mailing-list
-
lists.apache.org
/thread.html/091b518265bce56a16af87b77c8cfacda902a02079e866f9fdf13b61%40%3Cusers.trafficserver.apache.org%3E
mailing-list
-
lists.apache.org
/thread.html/ff5b0821a6985159a832ff6d1a4bd311ac07ecc7db1e2d8bab619107%40%3Cdev.trafficserver.apache.org%3E
mailing-list
-
security.netapp.com
/advisory/ntap-20190823-0005/
third-party-advisory
-
seclists.org
/bugtraq/2019/Sep/18
mailing-list, third-party-advisory
-
kc.mcafee.com
/corporate/index?page=content&id=SB10296
third-party-advisory
- support.f5.com /csp/article/K46011592?utm_source=f5support&%3Butm_medium=RSS
-
lists.apache.org
/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.org%3E
mailing-list
-
lists.apache.org
/thread.html/r99a625fb17032646d96cd23dec49603ff630e9318e44a686d63046bc%40%3Ccommits.cassandra.apache.org%3E
mailing-list
-
lists.apache.org
/thread.html/rd31230d01fa6aad18bdadc0720acd1747e53690bd35f73a48e7a9b75%40%3Ccommits.cassandra.apache.org%3E
mailing-list
Sources
- CVE List CVE-2019-9518
- NVD CVE-2019-9518
Fencer Vulns 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.