Krebs on Security – (International) Backdoors found in Barracuda Networks gear. Various spam filters, firewalls, and VPN appliances sold by Barracuda Networks contain undocumented backdoor accounts that could be remotely accessed via secure shell (SSH) and are accessible to hundreds of non-Barracuda companies, the vendor acknowledged.
Source: http://krebsonsecurity.com/2013/01/backdoors-found-in-barracuda-networks-gear/