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Fencer Intel
high 7.5

CVE-2019-9517 in the critical feed json

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service

published 7y ago modified 4mo ago also EUVD-2019-18889

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
27.0%
EPSS 27.0% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

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.

Patch / fix

  • apache http_server 2.4.40
  • 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
  • apache2 Debian 14, Debian 13, Debian 12 2.4.41-1

debian advisories DEBIAN-CVE-2019-9517

  • apache2 Ubuntu 18.04 LTS 2.4.29-1ubuntu4.10

ubuntu advisories UBUNTU-CVE-2019-9517

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-2019:3932RHSA-2019:3933RHSA-2019:2939RHSA-2019:2946

  • nodejs12 SLE Module for Web and Scripting 12 12.13.0-1.3.1
  • apache2 SLES for SAP 12 SP4, SLES 12 SP4, SLE Software Development Kit 12 SP4 2.4.23-29.43.1
  • 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
  • apache2 SLE Module for Server Applications 15 SP1, SLE Module for Server Applications 15 2.4.33-3.21.1
  • 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

suse advisories SUSE-SU-2019:14246-1SUSE-SU-2020:0059-1SUSE-SU-2019:2329-1SUSE-SU-2019:2260-1SUSE-SU-2019:2259-1SUSE-SU-2019:2254-1

  • apache2 openSUSE Tumbleweed 2.4.49-1.1
  • 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
  • apache2 openSUSE Leap 15.1, openSUSE Leap 15.0 2.4.33-lp151.8.6.1

opensuse advisories openSUSE-SU-2024:10623-1openSUSE-SU-2019:2115-1openSUSE-SU-2019:2114-1openSUSE-SU-2019:2051-1

  • 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
  • apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 2.4.41-r0

alpine advisories ALPINE-CVE-2019-9517

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-2019-9517 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-2019-9517 updated cvss 7.5

HTTP/2: request for large response leads to denial of service

  • Red Hat AMQ Broker 7 jetty Red Hat JBoss Enterprise Application Platform 7 undertow-core
    affected: workaround, no fix available
  • Red Hat JBoss Enterprise Web Server 3 httpd Red Hat JBoss Fuse 6 undertow undertow Red Hat OpenShift Application Runtimes rhoar-nodejs rhoar-nodejs
    affected: workaround, 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 Enterprise Linux AppStream (v. 8) httpd 2.4.37-12.module+el8.0.0+4096+eb40e6da, mod_md 2.4.37-12.module+el8.0.0+4096+eb40e6da, nodejs 10.16.3-2.module+el8.0.0+4214+49953fda, mod_ssl 2.4.37-12.module+el8.0.0+4096+eb40e6da, nodejs-packaging 17-3.module+el8+2873+aa7dfd9a, mod_http2 1.11.3-3.module+el8.0.0+4096+eb40e6da, +8 more
    fixed: vendor fix RHSA-2019:2893
  • Red Hat Fuse 7.6.0
    fixed: vendor fix RHSA-2020:0983
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2019:2950
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el6, jbcs-httpd24-brotli 1.0.6-7.jbcs.el6, jbcs-httpd24-curl 7.64.1-14.jbcs.el6, jbcs-httpd24-httpd 2.4.29-41.jbcs.el6, jbcs-httpd24-httpd 2.4.37-33.jbcs.el6, jbcs-httpd24-jansson 2.11-20.jbcs.el6, +34 more
    fixed: vendor fix RHSA-2019:3932
show 3 more
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el7, jbcs-httpd24-brotli 1.0.6-7.jbcs.el7, jbcs-httpd24-curl 7.64.1-14.jbcs.el7, jbcs-httpd24-httpd 2.4.29-41.jbcs.el7, jbcs-httpd24-httpd 2.4.37-33.jbcs.el7, jbcs-httpd24-jansson 2.11-20.jbcs.el7, +34 more
    fixed: vendor fix RHSA-2019:2946
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-httpd 2.4.34-8.el6.1, httpd24-nghttp2 1.7.1-7.el6.1, httpd24-mod_ssl 2.4.34-8.el6.1, httpd24-mod_ldap 2.4.34-8.el6.1, httpd24-libnghttp2 1.7.1-7.el6.1, httpd24-httpd-tools 2.4.34-8.el6.1, +3 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, httpd24-httpd 2.4.34-8.el7.1, rh-nodejs8-runtime 3.0-5.el7, httpd24-mod_md 2.4.34-8.el7.1, httpd24-nghttp2 1.7.1-7.el7.1, +14 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, httpd24-httpd 2.4.34-8.el7.1, rh-nodejs8-runtime 3.0-5.el7, httpd24-mod_md 2.4.34-8.el7.1, httpd24-nghttp2 1.7.1-7.el7.1, +14 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, httpd24-httpd 2.4.34-8.el7.1, rh-nodejs8-runtime 3.0-5.el7, httpd24-mod_md 2.4.34-8.el7.1, httpd24-nghttp2 1.7.1-7.el7.1, +14 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, httpd24-httpd 2.4.34-8.el7.1, rh-nodejs8-runtime 3.0-5.el7, httpd24-mod_md 2.4.34-8.el7.1, httpd24-nghttp2 1.7.1-7.el7.1, +14 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-httpd 2.4.34-8.el6.1, httpd24-nghttp2 1.7.1-7.el6.1, httpd24-mod_ssl 2.4.34-8.el6.1, httpd24-mod_ldap 2.4.34-8.el6.1, httpd24-libnghttp2 1.7.1-7.el6.1, httpd24-httpd-tools 2.4.34-8.el6.1, +3 more
    +1 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, httpd24-httpd 2.4.34-8.el7.1, rh-nodejs8-runtime 3.0-5.el7, httpd24-mod_md 2.4.34-8.el7.1, httpd24-nghttp2 1.7.1-7.el7.1, +14 more
    fixed: vendor fix RHSA-2019:2949
  • 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 Ansible Tower 3 nginx Red Hat Enterprise Linux 8 nginx, nghttp2, libnghttp2, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, +4 more Red Hat JBoss Data Grid 7 undertow undertow Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb Red Hat JBoss Web Server 5 nghttp2
    +9 more products
    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 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

27.00% chance of exploitation in the next 30 days, higher than 98% 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.