Description
NetBIOS provides services related to the session layer of the OSI model allowing applications on separate computers to communicate over a local area network. Port 139 is using for session service - connection-oriented communication. This port is open on your Windows virtual machine and allows all incoming traffic from the Internet. In order to keep security best practices and decrease the risk for malicious activities, you should restrict access to be only from allowed IP addresses.
Network misconfigurations
