("admin/admin" or similar). If these aren't changed, an assailant can literally merely log in. The Mirai botnet in 2016 famously infected hundreds of thousands of IoT devices by basically trying a directory of arrears passwords for products like routers and even cameras, since customers rarely changed these people. - Directory listing enabled on a net server, exposing all files if simply no index page will be present. This may possibly reveal sensitive documents. - Leaving debug mode or verbose error messages upon in production. Debug pages c