Panasonic Arbitrator Back-End Server (BES) MK 2.0 VPU before 9.3.1 build 4.08.003.0, when USB Wi-Fi or Direct LAN is enabled, and MK 3.0 VPU before 9.3.1 build 5.06.000.0, when Embedded Wi-Fi or Direct LAN is enabled, does not use encryption, which allows remote attackers to obtain sensitive information by sniffing the network for client-server traffic, as demonstrated by Active Directory credential information.