Legacy automotive buses lack authentication: any compromised ECU can inject spoofed torque messages or flood the arbitration bus. Automotive Intrusion Detection Systems (IDS) operate at wire speed, monitoring inter-arrival timing intervals, message sequence counters, and payload entropies. Suspicious events are logged to the in-vehicle Security Event Manager (SEvM) and reported to the cloud VSOC.
When an attacker connects to a CAN-FD bus through an exposed OBD-II port, they cannot silence the legitimate transmitting ECU. To override steering commands, the adversary transmits spoofed frames with identical arbitration IDs at high frequency. An in-vehicle IDS engine tracks the inter-arrival delta: if 10ms steering frames suddenly arrive within 800 microseconds, the IDS instantly flags a injection attack and instructs the gateway to isolate the compromised physical port.