Avaya Cajun switches P880, P882, P580, and P550R 5.2.14 and earlier contain undocumented accounts (1) manuf and (2) diag with default passwords, which allows remote attackers to gain privileges.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2002-1213
http://www.securityfocus.com/bid/5965
http://www.kb.cert.org/vuls/id/482241