Cisco Systems has released software updates for its Nexus 3000 and 3500 switches in order to remove a default administrative account with static credentials that could allow remote attackers to compromise devices. The default account is created at installation time by the Cisco NX-OS software that runs on these switches and it cannot be changed or deleted without affecting the system’s functionality. The company rated the issue as critical because authenticating with this account can provide attackers with access to a bash shell with root privileges, meaning that they can fully control the device.”]