CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2019-9517
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.
Severity
- EPSS
- 28% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-770, CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- apache:http_server
- apache:traffic_server
- apple:swiftnio
- canonical:ubuntu_linux
- debian:debian_linux
- fedoraproject:fedora
- mcafee:web_gateway
- netapp:clustered_data_ontap
- nodejs:node.js
- opensuse:leap
- oracle:communications_element_manager
- oracle:graalvm
- oracle:instantis_enterprisetrack
- oracle:retail_xstore_point_of_service
- 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/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
- http://www.openwall.com/lists/oss-security/2019/08/15/7
- https://access.redhat.com/errata/RHSA-2019:2893