{"id":"UBUNTU-CVE-2018-8011","details":"By specially crafting HTTP requests, the mod_md challenge handler would dereference a NULL pointer and cause the child process to segfault. This could be used to DoS the server. Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.33).","modified":"2025-07-16T08:14:12.968681Z","published":"2018-07-18T14:29:00Z","withdrawn":"2025-07-18T16:44:32Z","upstream":["CVE-2018-8011"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-8011"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2018/07/18/2"},{"type":"REPORT","url":"https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-8011"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-8011"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.7-1ubuntu4.20?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.7-1ubuntu4.20"}]}],"versions":["2.4.6-2ubuntu2","2.4.6-2ubuntu3","2.4.6-2ubuntu4","2.4.7-1ubuntu1","2.4.7-1ubuntu2","2.4.7-1ubuntu3","2.4.7-1ubuntu4","2.4.7-1ubuntu4.1","2.4.7-1ubuntu4.4","2.4.7-1ubuntu4.5","2.4.7-1ubuntu4.6","2.4.7-1ubuntu4.7","2.4.7-1ubuntu4.8","2.4.7-1ubuntu4.9","2.4.7-1ubuntu4.10","2.4.7-1ubuntu4.11","2.4.7-1ubuntu4.13","2.4.7-1ubuntu4.15","2.4.7-1ubuntu4.16","2.4.7-1ubuntu4.17","2.4.7-1ubuntu4.18","2.4.7-1ubuntu4.19"],"ecosystem_specific":{"binaries":[{"binary_name":"apache2","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-bin","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-bin-dbgsym","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-data","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-dbg","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-dev","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-doc","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-mpm-event","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-mpm-itk","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-mpm-prefork","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-mpm-worker","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-suexec","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-suexec-custom-dbgsym","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-suexec-pristine-dbgsym","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-utils","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2-utils-dbgsym","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"apache2.2-bin","binary_version":"2.4.7-1ubuntu4.20"},{"binary_name":"libapache2-mod-macro","binary_version":"1:2.4.7-1ubuntu4.20"},{"binary_name":"libapache2-mod-proxy-html","binary_version":"1:2.4.7-1ubuntu4.20"}],"availability":"No subscription 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