High severity7.5NVD Advisory· Published Aug 13, 2019· Updated Jun 17, 2026

CVE-2019-9517

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

HTTP/2/HTTP/2description
osv-coords33 versions
pkg:rpm/suse/firefox-libffi&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/firefox-pango&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/mozilla-nss&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/opensuse/nodejs10&distro=openSUSE%20Leap%2015.0 pkg:rpm/suse/nodejs12&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2012 pkg:rpm/suse/MozillaFirefox-branding-SLED&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/firefox-atk&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/firefox-glib2&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/firefox-gtk3&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015 pkg:rpm/suse/nodejs10&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2012 pkg:rpm/suse/nodejs10&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015 pkg:rpm/suse/nodejs8&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP1 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4 pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4 pkg:rpm/opensuse/apache2&distro=openSUSE%20Tumbleweed pkg:rpm/almalinux/nodejs-packaging pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP4 pkg:rpm/suse/firefox-harfbuzz&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/opensuse/apache2&distro=openSUSE%20Leap%2015.1 pkg:rpm/suse/firefox-cairo&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/apache2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP1 pkg:rpm/suse/nodejs8&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015 pkg:rpm/almalinux/nodejs-nodemon pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/firefox-libffi-gcc5&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/mozilla-nspr&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/firefox-gdk-pixbuf&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/nodejs10&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP1 pkg:rpm/opensuse/apache2&distro=openSUSE%20Leap%2015.0 pkg:rpm/opensuse/nodejs10&distro=openSUSE%20Leap%2015.1 pkg:rpm/opensuse/nodejs8&distro=openSUSE%20Leap%2015.0 pkg:rpm/opensuse/nodejs8&distro=openSUSE%20Leap%2015.1
< 3.2.1.git259-2.3.3+ 32 more
- (no CPE)range: < 3.2.1.git259-2.3.3
- (no CPE)range: < 1.40.14-2.7.4
- (no CPE)range: < 3.45-38.9.3
- (no CPE)range: < 10.16.3-lp151.2.6.1
- (no CPE)range: < 12.13.0-1.3.1
- (no CPE)range: < 68-21.9.8
- (no CPE)range: < 2.26.1-2.8.4
- (no CPE)range: < 2.54.3-2.14.7
- (no CPE)range: < 3.10.9-2.15.3
- (no CPE)range: < 2.4.33-3.21.1
- (no CPE)range: < 10.16.3-1.12.1
- (no CPE)range: < 10.16.3-1.12.1
- (no CPE)range: < 8.16.1-3.20.1
- (no CPE)range: < 2.4.23-29.43.1
- (no CPE)range: < 2.4.23-29.43.1
- (no CPE)range: < 2.4.49-1.1
- (no CPE)range: < 17-3.module_el8.4.0+2224+b07ac28e
- (no CPE)range: < 2.4.23-29.43.1
- (no CPE)range: < 1.7.5-2.7.4
- (no CPE)range: < 2.4.33-lp151.8.6.1
- (no CPE)range: < 1.15.10-2.13.4
- (no CPE)range: < 2.4.33-3.21.1
- (no CPE)range: < 8.16.1-3.20.1
- (no CPE)range: < 1.18.3-1.module_el8.3.0+2023+d2377ea3
- (no CPE)range: < 68.2.0-78.51.4
- (no CPE)range: < 5.3.1+r233831-14.1
- (no CPE)range: < 4.21-29.6.1
- (no CPE)range: < 2.36.11-2.8.4
- (no CPE)range: < 10.16.3-1.12.1
- (no CPE)range: < 2.4.33-lp151.8.6.1
- (no CPE)range: < 10.16.3-lp151.2.6.1
- (no CPE)range: < 8.16.1-lp151.2.6.1
- (no CPE)range: < 8.16.1-lp151.2.6.1
Apple Inc./SwiftNIO
cpe:2.3:a:apple:swiftnio:*:*:*:*:*:*:*:*
Range: >=1.0.0,<=1.4.0
Apache/HTTP Server
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
Range: >=2.4.20,<2.4.40
Apache/trafficserver
cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*
Range: >=6.0.0,<=6.2.3
Canonical/Ubuntu Linux3 versions
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*+ 2 more
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
Debian/linux2 versions
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Synology/Skynas
cpe:2.3:a:synology:skynas:-:*:*:*:*:*:*:*
Synology/Diskstation Manager
cpe:2.3:o:synology:diskstation_manager:6.2:*:*:*:*:*:*:*
Synology/Vs960hd Firmware
cpe:2.3:o:synology:vs960hd_firmware:-:*:*:*:*:*:*:*
Fedoraproject/Fedora2 versions
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
OpenSUSE/Leap2 versions
cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
Red Hat/Jboss Core Services
cpe:2.3:a:redhat:jboss_core_services:1.0:*:*:*:*:*:*:*
Red Hat/Jboss Enterprise Application Platform2 versions
cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.2.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.3.0:*:*:*:*:*:*:*
Red Hat/OpenShift ServiceMesh (maistra)
cpe:2.3:a:redhat:openshift_service_mesh:1.0:*:*:*:*:*:*:*
Red Hat/Quay
cpe:2.3:a:redhat:quay:3.0.0:*:*:*:*:*:*:*
Red Hat/Software Collections
cpe:2.3:a:redhat:software_collections:1.0:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
Oracle Corporation/Communications Element Manager4 versions
cpe:2.3:a:oracle:communications_element_manager:8.0.0:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:oracle:communications_element_manager:8.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_element_manager:8.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_element_manager:8.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_element_manager:8.2.0:*:*:*:*:*:*:*
Oracle Corporation/Graalvm For Jdk
cpe:2.3:a:oracle:graalvm:19.2.0:*:*:*:enterprise:*:*:*
Oracle Corporation/Instantis Enterprisetrack
cpe:2.3:a:oracle:instantis_enterprisetrack:*:*:*:*:*:*:*:*
Range: >=17.1,<=17.3
Oracle Corporation/Retail Xstore Point Of Service
cpe:2.3:a:oracle:retail_xstore_point_of_service:7.1:*:*:*:*:*:*:*
McAfee/Web Gateway
cpe:2.3:a:mcafee:web_gateway:*:*:*:*:*:*:*:*
Range: >=7.7.2.0,<7.7.2.24
NetApp/Clustered Data Ontap
cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*
Node.js/Node.js2 versions
cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*range: >=8.0.0,<=8.8.1
- cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*range: >=8.9.0,<8.16.1

Patches

Vulnerability mechanics

References

www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.htmlnvdPatchThird Party Advisory
lists.opensuse.org/opensuse-security-announce/2019-09/msg00004.htmlnvdMailing ListThird Party Advisory
lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.htmlnvdMailing ListThird Party Advisory
lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.htmlnvdMailing ListThird Party Advisory
www.openwall.com/lists/oss-security/2019/08/15/7nvdMailing ListThird Party Advisory
access.redhat.com/errata/RHSA-2019:2893nvdThird Party Advisory
access.redhat.com/errata/RHSA-2019:2925nvdThird Party Advisory
access.redhat.com/errata/RHSA-2019:2939nvdThird Party Advisory
access.redhat.com/errata/RHSA-2019:2946nvdThird Party Advisory
access.redhat.com/errata/RHSA-2019:2949nvdThird Party Advisory
access.redhat.com/errata/RHSA-2019:2950nvdThird Party Advisory
access.redhat.com/errata/RHSA-2019:2955nvdThird Party Advisory
access.redhat.com/errata/RHSA-2019:3932nvdThird Party Advisory
access.redhat.com/errata/RHSA-2019:3933nvdThird Party Advisory
access.redhat.com/errata/RHSA-2019:3935nvdThird Party Advisory
github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.mdnvdThird Party Advisory
kb.cert.org/vuls/id/605641/nvdThird Party AdvisoryUS Government Resource
kc.mcafee.com/corporate/indexnvdThird Party Advisory
seclists.org/bugtraq/2019/Aug/47nvdMailing ListThird Party Advisory
security.gentoo.org/glsa/201909-04nvdThird Party Advisory
security.netapp.com/advisory/ntap-20190823-0003/nvdThird Party Advisory
security.netapp.com/advisory/ntap-20190823-0005/nvdThird Party Advisory
security.netapp.com/advisory/ntap-20190905-0003/nvdThird Party Advisory
support.f5.com/csp/article/K02591030nvdThird Party Advisory
usn.ubuntu.com/4113-1/nvdThird Party Advisory
www.debian.org/security/2019/dsa-4509nvdThird Party Advisory
www.oracle.com/security-alerts/cpuapr2020.htmlnvdThird Party Advisory
www.synology.com/security/advisory/Synology_SA_19_33nvdThird Party Advisory
lists.apache.org/thread.html/4610762456644181b267c846423b3a990bd4aaea1886ecc7d51febdb%40%3Cannounce.httpd.apache.org%3Envd
lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/d89f999e26dfb1d50f247ead1fe8538014eb412b2dbe5be4b1a9ef50%40%3Cdev.httpd.apache.org%3Envd
lists.apache.org/thread.html/ec97fdfc1a859266e56fef084353a34e0a0b08901b3c1aa317a43c8c%40%3Cdev.httpd.apache.org%3Envd
lists.apache.org/thread.html/r03ee478b3dda3e381fd6189366fa7af97c980d2f602846eef935277d%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/rd2fb621142e7fa187cfe12d7137bf66e7234abcbbcd800074c84a538%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3Envd
lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3Envd
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/nvd
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/nvd
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/nvd
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/nvd
support.f5.com/csp/article/K02591030nvd

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cvss	0.488
epss	0.022
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000