Indian Scout 2025: Infotainment skips PIN entry when WCM is silent at boot

Incorrect behavior order in the Infotainment / Digital Round display of the Indian Motorcycle Scout Bobber + Tech 2025 model year allows an adjacent-network attacker to bypass the PIN entry screen. The Infotainment uses presence of Wireless Control Module (WCM) traffic during its boot window as a proxy for whether an immobilizer is fitted; if no WCM messages are observed, it skips the PIN entry screen and shows the normal user interface. An attacker who silences the WCM during the boot window — for example via a separately tracked CAN bus-off technique — can present a fully unlocked Infotainment despite the PIN never being entered.

Specific timing and protocol details have been withheld pending vendor remediation.

Recommended remediation:

Fail secure on WCM absence: if the Infotainment cannot positively identify a WCM via signed challenge-response with a per-boot nonce, default to a locked screen indicating WCM service required, rather than skipping the PIN entry.

Scott Sheahan, Rustic Security LLC (finder)

2025-03-26: Reported to Indian Motorcycle (Polaris Inc.) by Rustic Security LLC under responsible disclosure

2026-05-29: Public disclosure by ASRG