{"id":"UBUNTU-CVE-2020-28896","details":"Mutt before 2.0.2 and NeoMutt before 2020-11-20 did not ensure that $ssl_force_tls was processed if an IMAP server's initial server response was invalid. The connection was not properly closed, and the code could continue attempting to authenticate. This could result in authentication credentials being exposed on an unencrypted connection, or to a machine-in-the-middle.","modified":"2026-01-30T01:42:44.882463Z","published":"2020-11-23T19:15:00Z","related":["USN-4645-1","USN-7204-1"],"upstream":["CVE-2020-28896"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-28896"},{"type":"REPORT","url":"https://github.com/neomutt/neomutt/releases/tag/20201120"},{"type":"REPORT","url":"https://gitlab.com/muttmua/mutt/-/commit/d92689088dfe80a290ec836e292376e2d9984f8f"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4645-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-28896"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7204-1"}],"affected":[{"package":{"name":"mutt","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/mutt@1.5.24-1ubuntu0.5?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.24-1ubuntu0.5"}]}],"versions":["1.5.23-3.1ubuntu1","1.5.23-3.1ubuntu2","1.5.24-1","1.5.24-1build1","1.5.24-1ubuntu0.1","1.5.24-1ubuntu0.2","1.5.24-1ubuntu0.3","1.5.24-1ubuntu0.4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"mutt","binary_version":"1.5.24-1ubuntu0.5"},{"binary_name":"mutt-patched","binary_version":"1.5.24-1ubuntu0.5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-28896.json"}},{"package":{"name":"mutt","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/mutt@1.9.4-3ubuntu0.4?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.4-3ubuntu0.4"}]}],"versions":["1.8.3+neomutt20170609-2build1","1.9.1-2","1.9.1-3","1.9.1-4","1.9.1-5","1.9.2-1","1.9.3-1","1.9.4-2","1.9.4-3","1.9.4-3ubuntu0.1","1.9.4-3ubuntu0.2","1.9.4-3ubuntu0.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"mutt","binary_version":"1.9.4-3ubuntu0.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-28896.json"}},{"package":{"name":"neomutt","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/neomutt@20171215+dfsg.1-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"20171215+dfsg.1-1ubuntu0.1~esm1"}]}],"versions":["20171027-1","20171027-2","20171027+dfsg.1-1","20171027+dfsg.1-2","20171027+dfsg.1-4","20171208+dfsg.1-1","20171208+dfsg.1-2","20171215+dfsg.1-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"20171215+dfsg.1-1ubuntu0.1~esm1","binary_name":"neomutt"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-28896.json"}},{"package":{"name":"mutt","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/mutt@1.13.2-1ubuntu0.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.2-1ubuntu0.3"}]}],"versions":["1.10.1-2.1","1.12.2-1","1.12.2-2","1.13.0-1","1.13.2-1","1.13.2-1ubuntu0.1","1.13.2-1ubuntu0.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"mutt","binary_version":"1.13.2-1ubuntu0.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-28896.json"}},{"package":{"name":"neomutt","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/neomutt@20191207+dfsg.1-1.1ubuntu0.1~esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"20191207+dfsg.1-1.1ubuntu0.1~esm1"}]}],"versions":["20180716+dfsg.1-1.2","20191111+dfsg.1-1","20191207+dfsg.1-1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"neomutt","binary_version":"20191207+dfsg.1-1.1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-28896.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}