CVE-2002-0672
Pingtel xpressa SIP-based voice-over-IP phone 1.2.5 through 1.2.7.4 allows attackers with physical access to restore the phone to factory defaults without authentication via a menu option, which sets the administrator password to null.
Date published : 2004-09-01
http://www.atstake.com/research/advisories/2002/a071202-1.txt