A DEF CON 34 main-stage talk will pull back the curtain on a heavy-duty truck recall that appears to have quietly fixed more than it admitted.
Ben Gardiner, a senior cybersecurity research engineer contractor at the National Motor Freight Traffic Association (NMFTA), was analyzing a major supplier’s recall that was framed as a response to a seemingly harmless noise issue. The explanation, he says, did not add up.
By tearing apart the recall’s firmware, tracing ECU behavior, and studying update protocols, Gardiner found evidence that the update carried a security mitigation for undisclosed vulnerabilities in a critical vehicle system. The patch was hidden inside what looked like a routine bug fix.
The research walks through how modern tractor ECUs can be analyzed with professional and public tooling, including IDA Pro, idapython, and qbindiff, and the challenges of working with safety-critical microcontrollers like the NXP S12XE used in heavy vehicles.
Heavy-duty trucks carry most of North America’s freight, making them critical infrastructure. Gardiner argues the discovery highlights the growing cybersecurity risk facing commercial vehicles, where silent patches and undisclosed flaws leave fleets and the supply chain exposed.
The talk, “Reversing a Recall: From Noise Triggered to RCE,” runs 60 minutes on the main stage at DEF CON 34.
