Fortinet FortiSwitch FSW-108D-POE FSW-124D FSW-124D-POE FSW-224D-POE FSW-224D-FPOE FSW-248D-POE FSW-248D-FPOE FSW-424D FSW-424D-POE FSW-424D-FPOE FSW-448D FSW-448D-POE FSW-448D-FPOE FSW-524D FSW-524D-FPOE FSW-548D FSW-548D-FPOE FSW-1024D FSW-1048D FSW-3032D and FSW-R-112D-POE models when in FortiLink managed mode and upgraded to 3.4.1 might allow remote attackers to bypass authentication and gain administrative access via an empty password for the rest_admin account.