The vagus nerve is a major cranial nerve that links the brain to internal organs and helps control autonomic functions such as heart rate, digestion, and stress responses. In medicine, it is also a target for vagus nerve stimulation devices that interact with the body through implanted or wearable hardware.
In cyber security, the term matters because any connected system that monitors or influences autonomic activity becomes a safety and privacy target. A compromised medical device could expose sensitive health data, change stimulation settings, or disrupt therapy. Defenders focus on strong authentication, signed firmware, secure update paths, and careful monitoring of device behavior to reduce cyber-physical risk.