Lotus Domino 5.0.5 and 5.0.8, and possibly other versions, allows remote attackers to cause a denial of service (block access to databases that have not been previously accessed) via a URL that includes the . (dot) directory.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7684
http://www.securityfocus.com/bid/3656
http://www-1.ibm.com/support/manager.wss?rs=1&rt=0&org=sims&doc=255CC03D83CFF50C85256B1E005E349B