Unknown vulnerability in Xerox MicroServer Web Server in Document Centre 220 through 265, 332 and 340, 420 through 490, and 535 through 555 allows remote attackers to bypass authentication.
http://www.xerox.com/downloads/usa/en/c/cert_XRX05_009.pdf
http://www.xerox.com/downloads/usa/en/c/cert_XRX05_008.pdf