Unknown vulnerability in the web server for the ESS/ Network Controller for Xerox Document Centre 240 through 555 running System Software 27.18.017 and earlier allows attackers to "gain unauthorized access."
https://exchange.xforce.ibmcloud.com/vulnerabilities/19661
http://www.xerox.com/downloads/usa/en/c/cert_XRX05_003.pdf
http://www.vupen.com/english/advisories/2005/0255