Multiple buffer overflows in MMDF on OpenServer 5.0.6 and 5.0.7, and possibly other operating systems, may allow attackers to execute arbitrary code, as demonstrated via the execmail program.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16738
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-0509
http://www.securityfocus.com/bid/10758