dovecot is vulnerable to authorization bypass. A remote, authenticated user can bypass intended access restrictions or conduct a directory traversal attack by leveraging login scripts.
dovecot.org/pipermail/dovecot/2011-May/059085.html
openwall.com/lists/oss-security/2011/05/18/4
rhn.redhat.com/errata/RHSA-2013-0520.html
secunia.com/advisories/52311
www.dovecot.org/doc/NEWS-2.0
www.securityfocus.com/bid/48003
access.redhat.com/security/updates/classification/#low
exchange.xforce.ibmcloud.com/vulnerabilities/67674
rhn.redhat.com/errata/RHSA-2013-0520.html