nss_ldap earlier than 121, when run with nscd (name service caching daemon), allows remote attackers to cause a denial of service via a flood of LDAP requests.
https://exchange.xforce.ibmcloud.com/vulnerabilities/5449
http://www.securityfocus.com/bid/1863
http://www.redhat.com/support/errata/RHSA-2000-024.html
http://www.linux-mandrake.com/en/security/MDKSA-2000-066-1.php3