Format string vulnerability in the IMAP4rev1 server in Alt-N MDaemon 8.1.1 and possibly 8.1.4 allows remote attackers to cause a denial of service (CPU consumption) by creating and then listing folders whose names contain format string specifiers.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24916
http://www.vupen.com/english/advisories/2006/0729
http://www.securityfocus.com/bid/16854