{"id":"UBUNTU-CVE-2020-11993","details":"Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent use of memory pools. Configuring the LogLevel of mod_http2 above \"info\" will mitigate this vulnerability for unpatched servers.","modified":"2026-01-30T01:06:22.557823Z","published":"2020-08-07T16:15:00Z","related":["USN-4458-1"],"upstream":["CVE-2020-11993"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-11993"},{"type":"REPORT","url":"https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11993"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2020/08/07/3"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4458-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-11993"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.14?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.29-1ubuntu4.14"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"apache2","binary_version":"2.4.29-1ubuntu4.14"},{"binary_name":"apache2-bin","binary_version":"2.4.29-1ubuntu4.14"},{"binary_name":"apache2-data","binary_version":"2.4.29-1ubuntu4.14"},{"binary_name":"apache2-dev","binary_version":"2.4.29-1ubuntu4.14"},{"binary_name":"apache2-ssl-dev","binary_version":"2.4.29-1ubuntu4.14"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.29-1ubuntu4.14"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.29-1ubuntu4.14"},{"binary_name":"apache2-utils","binary_version":"2.4.29-1ubuntu4.14"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11993.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/apache2@2.4.41-4ubuntu3.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.41-4ubuntu3.1"}]}],"versions":["2.4.41-1ubuntu1","2.4.41-4ubuntu1","2.4.41-4ubuntu2","2.4.41-4ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"apache2","binary_version":"2.4.41-4ubuntu3.1"},{"binary_name":"apache2-bin","binary_version":"2.4.41-4ubuntu3.1"},{"binary_name":"apache2-data","binary_version":"2.4.41-4ubuntu3.1"},{"binary_name":"apache2-dev","binary_version":"2.4.41-4ubuntu3.1"},{"binary_name":"apache2-ssl-dev","binary_version":"2.4.41-4ubuntu3.1"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.41-4ubuntu3.1"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.41-4ubuntu3.1"},{"binary_name":"apache2-utils","binary_version":"2.4.41-4ubuntu3.1"},{"binary_name":"libapache2-mod-md","binary_version":"2.4.41-4ubuntu3.1"},{"binary_name":"libapache2-mod-proxy-uwsgi","binary_version":"2.4.41-4ubuntu3.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11993.json"}}],"schema_version":"1.7.3","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"}]}