Many of the latest firewall, spam filter and VPN appliances sold by Barracuda Networks contain undocumented backdoor accounts, the company disclosed today. While the backdoor accounts are apparently set up so that they would only be accessible from Internet addresses assigned to Barracuda, they are in fact accessible to potentially hundreds of other companies and network owners. A security researcher at SEC Consult Vulnerability Lab found the backdoors, along with evidence that they may have existed since 2003.