{"id":"UBUNTU-CVE-2018-11763","details":"In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.","modified":"2026-01-30T00:36:16.611562Z","published":"2018-09-25T00:00:00Z","related":["USN-3783-1"],"upstream":["CVE-2018-11763"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-11763"},{"type":"REPORT","url":"http://www.securitytracker.com/id/1041713"},{"type":"REPORT","url":"https://httpd.apache.org/security/vulnerabilities_24.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3783-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-11763"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.4?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.29-1ubuntu4.4"}]}],"versions":["2.4.27-2ubuntu3","2.4.29-1ubuntu1","2.4.29-1ubuntu2","2.4.29-1ubuntu3","2.4.29-1ubuntu4","2.4.29-1ubuntu4.1","2.4.29-1ubuntu4.2","2.4.29-1ubuntu4.3"],"ecosystem_specific":{"binaries":[{"binary_name":"apache2","binary_version":"2.4.29-1ubuntu4.4"},{"binary_name":"apache2-bin","binary_version":"2.4.29-1ubuntu4.4"},{"binary_name":"apache2-data","binary_version":"2.4.29-1ubuntu4.4"},{"binary_name":"apache2-dev","binary_version":"2.4.29-1ubuntu4.4"},{"binary_name":"apache2-ssl-dev","binary_version":"2.4.29-1ubuntu4.4"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.29-1ubuntu4.4"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.29-1ubuntu4.4"},{"binary_name":"apache2-utils","binary_version":"2.4.29-1ubuntu4.4"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-11763.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}