This indicates an attack attempt against a stack-based buffer-overflow vulnerability in the IMAP service for MailEnable.
The vulnerability is caused by the software's inability to properly check the bounds of user-supplied input. Remote attackers may exploit this to execute arbitrary code.
MailEnable Professional and Enterprise Edition 2.0 through 2.35
Professional Edition 1.6 through 1.84
Enterprise Edition 1.1 through 1.41
Apply hotfix ME-10025: