You received this notification because an open port TELNET 23/TCP, and SSH 22/TCP are detected in your network.

A service called "port" is used to allow network communications for Internet connected devices. This port is used as an entry point on sending or receiving data between the communication sources, and destinations.

What are the possible risks?

A vulnerability in the Internet-connected devices with unsecure setting or weak configuration can cause unauthorized access that can exploit, and compromise this open port.

Normally, TELNET 23/TCP, and SSH 22/TCP are used for setting up routers and IoT devices, and it can be exploited to spread IoT malware like "Mirai", and its variants.

How can I prevent this from happening?

To prevent this from happening, do the following:

  1. If your device is currently using this port, make sure your device is updated to the latest firmware.
  2. Stop unnecessary service (Open Port 22 or 23) or do appropriate access management.

    You may check your router's manual for firewall configuration or visit the manufacturer's website to check for this information.

  3. Set a strong password on the device with the following qualifications:
    • Create a password with at least 8 characters
    • Use uppercase, and lowercase letters
    • Use a mix of letters, numbers, and symbols
  4. If you are not using the device, disconnect the device from your network.