{"id":"UBUNTU-CVE-2019-9518","details":"Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.","modified":"2026-02-12T19:00:32.870017Z","published":"2019-08-13T00:00:00Z","related":["USN-4866-1"],"upstream":["CVE-2019-9518"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-9518"},{"type":"REPORT","url":"https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md"},{"type":"REPORT","url":"https://netty.io/news/2019/08/13/4-1-39-Final.html"},{"type":"REPORT","url":"https://github.com/netty/netty/pull/9461"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4866-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-9518"}],"affected":[{"package":{"name":"netty","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/netty@1:4.1.7-4ubuntu0.1+esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.1.7-4ubuntu0.1+esm1"}]}],"versions":["1:4.1.7-4","1:4.1.7-4ubuntu0.1~esm1","1:4.1.7-4ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnetty-java","binary_version":"1:4.1.7-4ubuntu0.1+esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-9518.json"}},{"package":{"name":"trafficserver","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/trafficserver@7.1.2+ds-3?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.0.0-5","7.1.2+ds-2","7.1.2+ds-2build1","7.1.2+ds-3"],"ecosystem_specific":{"binaries":[{"binary_name":"trafficserver","binary_version":"7.1.2+ds-3"},{"binary_name":"trafficserver-dev","binary_version":"7.1.2+ds-3"},{"binary_name":"trafficserver-experimental-plugins","binary_version":"7.1.2+ds-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-9518.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}