{"id":"UBUNTU-CVE-2020-14363","details":"An integer overflow vulnerability leading to a double-free was found in libX11. This flaw allows a local privileged attacker to cause an application compiled with libX11 to crash, or in some cases, result in arbitrary code execution. The highest threat from this flaw is to confidentiality, integrity as well as system availability.","modified":"2026-04-22T14:03:43.963557Z","published":"2020-08-25T13:00:00Z","related":["USN-4487-1","USN-4487-2"],"upstream":["CVE-2020-14363"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-14363"},{"type":"REPORT","url":"https://lists.x.org/archives/xorg-announce/2020-August/003056.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4487-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4487-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-14363"}],"affected":[{"package":{"name":"libx11","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libx11@2:1.6.2-1ubuntu2.1+esm1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.6.2-1ubuntu2.1+esm1"}]}],"versions":["2:1.6.1-1ubuntu1","2:1.6.1-1ubuntu2","2:1.6.2-1ubuntu1","2:1.6.2-1ubuntu2","2:1.6.2-1ubuntu2.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"2:1.6.2-1ubuntu2.1+esm1","binary_name":"libx11-6"},{"binary_name":"libx11-data","binary_version":"2:1.6.2-1ubuntu2.1+esm1"},{"binary_name":"libx11-xcb1","binary_version":"2:1.6.2-1ubuntu2.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-14363.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libx11@2:1.6.3-1ubuntu2.2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.6.3-1ubuntu2.2"}]}],"versions":["2:1.6.3-1ubuntu2","2:1.6.3-1ubuntu2.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libx11-6","binary_version":"2:1.6.3-1ubuntu2.2"},{"binary_name":"libx11-data","binary_version":"2:1.6.3-1ubuntu2.2"},{"binary_name":"libx11-xcb1","binary_version":"2:1.6.3-1ubuntu2.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-14363.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libx11@2:1.6.4-3ubuntu0.3?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.6.4-3ubuntu0.3"}]}],"versions":["2:1.6.4-3","2:1.6.4-3ubuntu0.1","2:1.6.4-3ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_name":"libx11-6","binary_version":"2:1.6.4-3ubuntu0.3"},{"binary_name":"libx11-data","binary_version":"2:1.6.4-3ubuntu0.3"},{"binary_version":"2:1.6.4-3ubuntu0.3","binary_name":"libx11-xcb1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-14363.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libx11@2:1.6.9-2ubuntu1.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.6.9-2ubuntu1.1"}]}],"versions":["2:1.6.8-1","2:1.6.9-2","2:1.6.9-2ubuntu1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libx11-6","binary_version":"2:1.6.9-2ubuntu1.1"},{"binary_version":"2:1.6.9-2ubuntu1.1","binary_name":"libx11-data"},{"binary_name":"libx11-xcb1","binary_version":"2:1.6.9-2ubuntu1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-14363.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}