Apache for Win32 before 1.3.24, and 2.0.x before 2.0.34-beta, allows remote attackers to execute arbitrary commands via shell metacharacters (a | pipe character) provided as arguments to batch (.bat) or .cmd scripts, which are sent unfiltered to the shell interpreter, typically cmd.exe.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2002-0061
http://www.securityfocus.com/bid/4335
http://www.iss.net/security_center/static/8589.php
http://www.apacheweek.com/issues/02-03-29#apache1324