{"id":"UBUNTU-CVE-2020-28013","details":"Exim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles \"-F '.('\" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy.","modified":"2026-04-22T12:37:55.388772Z","published":"2021-05-04T13:30:00Z","related":["USN-4934-1","USN-4934-2"],"upstream":["CVE-2020-28013"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-28013"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4934-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4934-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-28013"}],"affected":[{"package":{"name":"exim4","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/exim4@4.82-3ubuntu2.4+esm3?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.82-3ubuntu2.4+esm3"}]}],"versions":["4.80-7ubuntu3","4.80-7ubuntu4","4.80-9ubuntu1","4.80-9ubuntu2","4.82-3ubuntu1","4.82-3ubuntu2","4.82-3ubuntu2.1","4.82-3ubuntu2.2","4.82-3ubuntu2.3","4.82-3ubuntu2.4","4.82-3ubuntu2.4+esm1","4.82-3ubuntu2.4+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"4.82-3ubuntu2.4+esm3","binary_name":"exim4"},{"binary_version":"4.82-3ubuntu2.4+esm3","binary_name":"exim4-base"},{"binary_version":"4.82-3ubuntu2.4+esm3","binary_name":"exim4-config"},{"binary_version":"4.82-3ubuntu2.4+esm3","binary_name":"exim4-daemon-heavy"},{"binary_version":"4.82-3ubuntu2.4+esm3","binary_name":"exim4-daemon-light"},{"binary_version":"4.82-3ubuntu2.4+esm3","binary_name":"eximon4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-28013.json"}},{"package":{"name":"exim4","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/exim4@4.86.2-2ubuntu2.6+esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.86.2-2ubuntu2.6+esm1"}]}],"versions":["4.86-3ubuntu1","4.86-7ubuntu1","4.86-7ubuntu2","4.86-7ubuntu3","4.86.2-2ubuntu1","4.86.2-2ubuntu2","4.86.2-2ubuntu2.1","4.86.2-2ubuntu2.2","4.86.2-2ubuntu2.3","4.86.2-2ubuntu2.4","4.86.2-2ubuntu2.5","4.86.2-2ubuntu2.6"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"4.86.2-2ubuntu2.6+esm1","binary_name":"exim4"},{"binary_version":"4.86.2-2ubuntu2.6+esm1","binary_name":"exim4-base"},{"binary_version":"4.86.2-2ubuntu2.6+esm1","binary_name":"exim4-config"},{"binary_version":"4.86.2-2ubuntu2.6+esm1","binary_name":"exim4-daemon-heavy"},{"binary_version":"4.86.2-2ubuntu2.6+esm1","binary_name":"exim4-daemon-light"},{"binary_version":"4.86.2-2ubuntu2.6+esm1","binary_name":"eximon4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-28013.json"}},{"package":{"name":"exim4","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/exim4@4.90.1-1ubuntu1.8?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.90.1-1ubuntu1.8"}]}],"versions":["4.89-5ubuntu1","4.89-9ubuntu1","4.89-9ubuntu2","4.89-9ubuntu3","4.89-9ubuntu4","4.90.1-1ubuntu1","4.90.1-1ubuntu1.1","4.90.1-1ubuntu1.2","4.90.1-1ubuntu1.3","4.90.1-1ubuntu1.4","4.90.1-1ubuntu1.5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.90.1-1ubuntu1.8","binary_name":"exim4"},{"binary_version":"4.90.1-1ubuntu1.8","binary_name":"exim4-base"},{"binary_version":"4.90.1-1ubuntu1.8","binary_name":"exim4-config"},{"binary_version":"4.90.1-1ubuntu1.8","binary_name":"exim4-daemon-heavy"},{"binary_version":"4.90.1-1ubuntu1.8","binary_name":"exim4-daemon-light"},{"binary_version":"4.90.1-1ubuntu1.8","binary_name":"eximon4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-28013.json"}},{"package":{"name":"exim4","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/exim4@4.93-13ubuntu1.5?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.93-13ubuntu1.5"}]}],"versions":["4.92.1-1ubuntu3","4.92.1-1ubuntu4","4.93~RC2-1ubuntu1","4.93-9ubuntu1","4.93-11ubuntu1","4.93-12ubuntu1","4.93-13ubuntu1","4.93-13ubuntu1.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.93-13ubuntu1.5","binary_name":"exim4"},{"binary_version":"4.93-13ubuntu1.5","binary_name":"exim4-base"},{"binary_version":"4.93-13ubuntu1.5","binary_name":"exim4-config"},{"binary_version":"4.93-13ubuntu1.5","binary_name":"exim4-daemon-heavy"},{"binary_version":"4.93-13ubuntu1.5","binary_name":"exim4-daemon-light"},{"binary_version":"4.93-13ubuntu1.5","binary_name":"eximon4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-28013.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":"Ubuntu","score":"medium"}]}