Integer overflow in the IMAP (IMAP4) support in Microsoft Exchange Server 2000 SP3 allows remote attackers to cause a denial of service (service hang) via crafted literals in an IMAP command, aka the "IMAP Literal Processing Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2054
https://exchange.xforce.ibmcloud.com/vulnerabilities/33890
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-026
http://www.vupen.com/english/advisories/2007/1711
http://www.us-cert.gov/cas/techalerts/TA07-128A.html
http://www.securitytracker.com/id?1018015
http://www.securityfocus.com/bid/23810
http://www.securityfocus.com/archive/1/468871/100/200/threaded
http://secunia.com/advisories/25183
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=526