source: https://www.securityfocus.com/bid/5365/info

IMail is a commercial email server software package distributed and maintained by Ipswitch, Incorporated. IMail is available for Microsoft Operating Systems.

When a HTTP POST command is made to the web calendaring service on port 8484, and the "content-length:" header field is blank, the service becomes unstable. It has been reported that such a transaction with the service results in a crash of the iwebcal service.

An attacker may exploit this vulnerability by submitting the following request to a vulnerable server:

POST / HTTP/1.0