hpnst.exe in the GoAhead-Webs webserver for HP Instant TopTools before 5.55 allows remote attackers to cause a denial of service (CPU consumption) via a request to hpnst.exe that calls itself, which causes an infinite loop.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2003-0165
http://www.securityfocus.com/bid/7246
http://marc.info/?l=bugtraq&m=104914959705949&w=2
http://archives.neohapsis.com/archives/vulnwatch/2003-q1/0164.html