Web server in Tektronix PhaserLink Printer 840.0 and earlier allows a remote attacker to gain administrator access by directly calling undocumented URLs such as ncl_items.html and ncl_subjects.html.

Tektronix PhaserLink 850 does not require authentication for access to configuration pages such as _ncl_subjects.shtml and _ncl_items.shtml, which allows remote attackers to modify configuration information and cause a denial of service by accessing the pages.