The recently discovered vulnerability involving fax lines on HP multi-function devices, termed Faxploit, is a reminder of the importance of fundamental security practices. Check Point Software released a very detailed analysis about the possibility of a network being attacked via a fax line. The folks that learn to do these basics consistently and well can significantly lessen their chance of a successful attack. Here are 5 areas to focus on: Vendor connections, open firewall ports, devices sitting outside the firewall, unmanaged mobile devices, and, it seems, even fax lines.”]
Source: https://www.csoonline.com/article/3306439/5-cyber-security-basics-you-cant-afford-to-ignore.html