CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCVE-2019-9516
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.
Severity
- EPSS
- 57% 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: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/msg00014.html
- http://seclists.org/fulldisclosure/2019/Aug/16