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Everyone knows the most common unsecure ports.
Http on port 80 doesn't encrypt traffic.
Telnet on port 23 transmits data in plaintext.
But, if you ask me having an open USB port (even for 5 seconds) is just as dangerous.
My rubber ducky is based off of a Arduino Micro, Visual Basic Script, and the keyboard_h library. The Arduino Micro acts as a HID (Human Interface Device) that creates a Visual Basic Script file that finds the directory of the USB specific which then delivers the payload.