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source: http://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