The LDAP server (nldap.exe) in IBM Lotus Domino before 7.0.1, 6.5.5, and 6.5.4 FP2 allows remote attackers to cause a denial of service (crash) via a long bind request, which triggers a null dereference.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24634
http://www.vupen.com/english/advisories/2006/0526
http://www.securityfocus.com/bid/16523
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=389
http://www-1.ibm.com/support/docview.wss?rs=463&uid=swg21229907