{"id":"UBUNTU-CVE-2019-0199","details":"The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API's blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.","modified":"2025-07-18T16:44:54Z","published":"2019-04-10T15:29:00Z","upstream":["CVE-2019-0199"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-0199"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-0199"}],"affected":[{"package":{"name":"tomcat8","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/tomcat8@8.5.39-1ubuntu1~18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.1"}]}],"versions":["8.5.21-1ubuntu1","8.5.29-1","8.5.30-1","8.5.30-1ubuntu1","8.5.30-1ubuntu1.2","8.5.30-1ubuntu1.3","8.5.30-1ubuntu1.4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libtomcat8-embed-java","binary_version":"8.5.39-1ubuntu1~18.04.1"},{"binary_name":"libtomcat8-java","binary_version":"8.5.39-1ubuntu1~18.04.1"},{"binary_name":"tomcat8","binary_version":"8.5.39-1ubuntu1~18.04.1"},{"binary_name":"tomcat8-admin","binary_version":"8.5.39-1ubuntu1~18.04.1"},{"binary_name":"tomcat8-common","binary_version":"8.5.39-1ubuntu1~18.04.1"},{"binary_name":"tomcat8-docs","binary_version":"8.5.39-1ubuntu1~18.04.1"},{"binary_name":"tomcat8-examples","binary_version":"8.5.39-1ubuntu1~18.04.1"},{"binary_name":"tomcat8-user","binary_version":"8.5.39-1ubuntu1~18.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-0199.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":"Ubuntu","score":"medium"}]}