Apache 2 before 2.0.47, when running on an IPv6 host, allows attackers to cause a denial of service (CPU consumption by infinite loop) when the FTP proxy server fails to create an IPv6 socket.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A183
http://www.redhat.com/support/errata/RHSA-2003-240.html
http://www.mandriva.com/security/advisories?name=MDKSA-2003:075