{"id":"UBUNTU-CVE-2020-12673","details":"In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read.","modified":"2026-02-04T04:36:53.424171Z","published":"2020-08-12T12:00:00Z","related":["USN-4456-1","USN-4456-2"],"upstream":["CVE-2020-12673"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-12673"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4456-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4456-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-12673"}],"affected":[{"package":{"name":"dovecot","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/dovecot@1:2.2.9-1ubuntu2.6+esm3?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.2.9-1ubuntu2.6+esm3"}]}],"versions":["1:2.1.7-7ubuntu3","1:2.2.9-1ubuntu1","1:2.2.9-1ubuntu2","1:2.2.9-1ubuntu2.1","1:2.2.9-1ubuntu2.3","1:2.2.9-1ubuntu2.4","1:2.2.9-1ubuntu2.5","1:2.2.9-1ubuntu2.6","1:2.2.9-1ubuntu2.6+esm1","1:2.2.9-1ubuntu2.6+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-core"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-dev"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-gssapi"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-imapd"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-ldap"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-lmtpd"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-managesieved"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-mysql"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-pgsql"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-pop3d"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-sieve"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-solr"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"dovecot-sqlite"},{"binary_version":"1:2.2.9-1ubuntu2.6+esm3","binary_name":"mail-stack-delivery"}],"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/2020/UBUNTU-CVE-2020-12673.json"}},{"package":{"name":"dovecot","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/dovecot@1:2.2.22-1ubuntu2.13?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.2.22-1ubuntu2.13"}]}],"versions":["1:2.2.18-2ubuntu2","1:2.2.22-1ubuntu1","1:2.2.22-1ubuntu2","1:2.2.22-1ubuntu2.1","1:2.2.22-1ubuntu2.2","1:2.2.22-1ubuntu2.3","1:2.2.22-1ubuntu2.4","1:2.2.22-1ubuntu2.6","1:2.2.22-1ubuntu2.7","1:2.2.22-1ubuntu2.8","1:2.2.22-1ubuntu2.9","1:2.2.22-1ubuntu2.10","1:2.2.22-1ubuntu2.11","1:2.2.22-1ubuntu2.12"],"ecosystem_specific":{"binaries":[{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-core"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-dev"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-gssapi"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-imapd"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-ldap"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-lmtpd"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-lucene"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-managesieved"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-mysql"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-pgsql"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-pop3d"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-sieve"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-solr"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"dovecot-sqlite"},{"binary_version":"1:2.2.22-1ubuntu2.13","binary_name":"mail-stack-delivery"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12673.json"}},{"package":{"name":"dovecot","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/dovecot@1:2.2.33.2-1ubuntu4.6?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.2.33.2-1ubuntu4.6"}]}],"versions":["1:2.2.27-3ubuntu1","1:2.2.33.2-1ubuntu1","1:2.2.33.2-1ubuntu2","1:2.2.33.2-1ubuntu3","1:2.2.33.2-1ubuntu4","1:2.2.33.2-1ubuntu4.1","1:2.2.33.2-1ubuntu4.2","1:2.2.33.2-1ubuntu4.3","1:2.2.33.2-1ubuntu4.4","1:2.2.33.2-1ubuntu4.5"],"ecosystem_specific":{"binaries":[{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-core"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-dev"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-gssapi"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-imapd"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-ldap"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-lmtpd"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-managesieved"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-mysql"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-pgsql"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-pop3d"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-sieve"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-solr"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"dovecot-sqlite"},{"binary_version":"1:2.2.33.2-1ubuntu4.6","binary_name":"mail-stack-delivery"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12673.json"}},{"package":{"name":"dovecot","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/dovecot@1:2.3.7.2-1ubuntu3.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.3.7.2-1ubuntu3.2"}]}],"versions":["1:2.3.4.1-5ubuntu3","1:2.3.7.2-1ubuntu1","1:2.3.7.2-1ubuntu2","1:2.3.7.2-1ubuntu3","1:2.3.7.2-1ubuntu3.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-auth-lua"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-core"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-dev"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-gssapi"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-imapd"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-ldap"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-lmtpd"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-lucene"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-managesieved"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-mysql"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-pgsql"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-pop3d"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-sieve"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-solr"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-sqlite"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"dovecot-submissiond"},{"binary_version":"1:2.3.7.2-1ubuntu3.2","binary_name":"mail-stack-delivery"}],"availability":"No 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