{"id":"UBUNTU-CVE-2017-2669","details":"Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.","modified":"2026-02-04T02:23:48.730738Z","published":"2017-04-10T00:00:00Z","withdrawn":"2025-07-18T16:43:48Z","related":["USN-3258-1","USN-3258-2"],"upstream":["CVE-2017-2669"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2017-2669"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3258-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3258-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2017-2669"}],"affected":[{"package":{"name":"dovecot","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/dovecot@1:2.2.9-1ubuntu2.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.2.9-1ubuntu2.1"}]}],"versions":["1:2.1.7-7ubuntu3","1:2.2.9-1ubuntu1","1:2.2.9-1ubuntu2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-core"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-dbg"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-dev"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-gssapi"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-imapd"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-ldap"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-lmtpd"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-managesieved"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-mysql"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-pgsql"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-pop3d"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-sieve"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-solr"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"dovecot-sqlite"},{"binary_version":"1:2.2.9-1ubuntu2.1","binary_name":"mail-stack-delivery"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-2669.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}