A remote overflow exists in Lotus Domino ESMTP Service. The relay policy check fails to limit the length of the incoming domain name resulting in a buffer overflow. With a specially crafted request, an attacker can cause a Notes server crash and possible execution of arbitrary code resulting in a loss of available and possibly integrity.
Upgrade to version 5.0.6 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.