CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2019-9511
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
Severity
- EPSS
- 60% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-770, CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- apache:traffic_server
- apple:swiftnio
- canonical:ubuntu_linux
- debian:debian_linux
- f5:nginx
- fedoraproject:fedora
- mcafee:web_gateway
- nodejs:node.js
- opensuse:leap
- oracle:enterprise_communications_broker
- oracle:graalvm
- redhat:enterprise_linux
- redhat:jboss_core_services
- redhat:jboss_enterprise_application_platform
- redhat:openshift_service_mesh
- redhat:quay
- redhat:software_collections
- synology:diskstation_manager
- synology:skynas
- synology:vs960hd_firmware
References
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.html