The Apache 2.0.x Win32 installation is shipped with a default script, /cgi-bin/test-cgi.bat, that allows an attacker to execute commands on the Apache server (although it is reported that any .bat file could open this vulnerability.) An attacker can send a pipe character with commands appended as parameters, which are then executed by Apache.

This bug is fixed in 1.3.24 and 2.0.34-beta, or remove /cgi-bin/test-cgi.bat