Stack-based buffer overflow in Atrium MERCUR IMAPD allows remote attackers to have an unknown impact via a certain SUBSCRIBE command.
https://www.immunityinc.com/downloads/immpartners/MercurImapSubscribe.tar
https://www.exploit-db.com/exploits/3537
https://exchange.xforce.ibmcloud.com/vulnerabilities/33216
http://www.vupen.com/english/advisories/2007/1092
http://www.securityfocus.com/bid/23050