{"id":"UBUNTU-CVE-2021-34798","details":"Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.","modified":"2026-04-22T12:55:30.967917Z","published":"2021-09-16T15:15:00Z","related":["USN-5090-1","USN-5090-2"],"upstream":["CVE-2021-34798"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-34798"},{"type":"REPORT","url":"https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2021-34798"},{"type":"REPORT","url":"http://httpd.apache.org/security/vulnerabilities_24.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5090-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5090-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-34798"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.7-1ubuntu4.22+esm2?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.7-1ubuntu4.22+esm2"}]}],"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","2.4.7-1ubuntu4.20","2.4.7-1ubuntu4.21","2.4.7-1ubuntu4.22","2.4.7-1ubuntu4.22+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-bin"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-data"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-mpm-event"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-mpm-itk"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-mpm-prefork"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-mpm-worker"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-suexec"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-suexec-custom"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-suexec-pristine"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2-utils"},{"binary_version":"2.4.7-1ubuntu4.22+esm2","binary_name":"apache2.2-bin"},{"binary_version":"1:2.4.7-1ubuntu4.22+esm2","binary_name":"libapache2-mod-macro"},{"binary_version":"1:2.4.7-1ubuntu4.22+esm2","binary_name":"libapache2-mod-proxy-html"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34798.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.18-2ubuntu3.17+esm2?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.18-2ubuntu3.17+esm2"}]}],"versions":["2.4.12-2ubuntu2","2.4.17-1ubuntu1","2.4.17-2ubuntu1","2.4.17-3ubuntu1","2.4.18-1ubuntu1","2.4.18-2ubuntu1","2.4.18-2ubuntu2","2.4.18-2ubuntu3","2.4.18-2ubuntu3.1","2.4.18-2ubuntu3.2","2.4.18-2ubuntu3.3","2.4.18-2ubuntu3.4","2.4.18-2ubuntu3.5","2.4.18-2ubuntu3.7","2.4.18-2ubuntu3.8","2.4.18-2ubuntu3.9","2.4.18-2ubuntu3.10","2.4.18-2ubuntu3.12","2.4.18-2ubuntu3.13","2.4.18-2ubuntu3.14","2.4.18-2ubuntu3.15","2.4.18-2ubuntu3.17","2.4.18-2ubuntu3.17+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.18-2ubuntu3.17+esm2","binary_name":"apache2"},{"binary_version":"2.4.18-2ubuntu3.17+esm2","binary_name":"apache2-bin"},{"binary_version":"2.4.18-2ubuntu3.17+esm2","binary_name":"apache2-data"},{"binary_version":"2.4.18-2ubuntu3.17+esm2","binary_name":"apache2-suexec-custom"},{"binary_version":"2.4.18-2ubuntu3.17+esm2","binary_name":"apache2-suexec-pristine"},{"binary_version":"2.4.18-2ubuntu3.17+esm2","binary_name":"apache2-utils"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34798.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.17?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.29-1ubuntu4.17"}]}],"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","2.4.29-1ubuntu4.4","2.4.29-1ubuntu4.5","2.4.29-1ubuntu4.6","2.4.29-1ubuntu4.7","2.4.29-1ubuntu4.8","2.4.29-1ubuntu4.10","2.4.29-1ubuntu4.11","2.4.29-1ubuntu4.12","2.4.29-1ubuntu4.13","2.4.29-1ubuntu4.14","2.4.29-1ubuntu4.16"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.29-1ubuntu4.17","binary_name":"apache2"},{"binary_version":"2.4.29-1ubuntu4.17","binary_name":"apache2-bin"},{"binary_version":"2.4.29-1ubuntu4.17","binary_name":"apache2-data"},{"binary_version":"2.4.29-1ubuntu4.17","binary_name":"apache2-suexec-custom"},{"binary_version":"2.4.29-1ubuntu4.17","binary_name":"apache2-suexec-pristine"},{"binary_version":"2.4.29-1ubuntu4.17","binary_name":"apache2-utils"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34798.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.41-4ubuntu3.5?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.41-4ubuntu3.5"}]}],"versions":["2.4.41-1ubuntu1","2.4.41-4ubuntu1","2.4.41-4ubuntu2","2.4.41-4ubuntu3","2.4.41-4ubuntu3.1","2.4.41-4ubuntu3.3","2.4.41-4ubuntu3.4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.41-4ubuntu3.5","binary_name":"apache2"},{"binary_version":"2.4.41-4ubuntu3.5","binary_name":"apache2-bin"},{"binary_version":"2.4.41-4ubuntu3.5","binary_name":"apache2-data"},{"binary_version":"2.4.41-4ubuntu3.5","binary_name":"apache2-suexec-custom"},{"binary_version":"2.4.41-4ubuntu3.5","binary_name":"apache2-suexec-pristine"},{"binary_version":"2.4.41-4ubuntu3.5","binary_name":"apache2-utils"},{"binary_version":"2.4.41-4ubuntu3.5","binary_name":"libapache2-mod-md"},{"binary_version":"2.4.41-4ubuntu3.5","binary_name":"libapache2-mod-proxy-uwsgi"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34798.json"}}],"schema_version":"1.7.5","severity":[{"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"}]}