Lotus Domino 5.08 and earlier allows remote attackers to cause a denial of service (crash) via a SunRPC NULL command to port 443.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7631
http://www.securityfocus.com/bid/3607
http://www-1.ibm.com/support/manager.wss?rs=0&rt=0&org=sims&doc=4C8E450DBF2E7F1885256B200079FA88