Modern vehicles are computers on wheels - dozens of networked ECUs, substantial software, and external connectivity via mobile networks, Wi-Fi, Bluetooth, companion apps and cloud backends - creating a large, safety-critical attack surface. Unlike most IT, a successful attack can affect physical safety (steering, braking, engine), driver privacy and enable theft, and because vehicles are remotely reachable, a vulnerability can potentially be exploited at scale across many vehicles. Test the whole ecosystem: in-vehicle networks/ECUs and buses, external interfaces (mobile/Wi-Fi/Bluetooth), the companion mobile apps, and the cloud backend and APIs. Remote compromise is demonstrated, not hypothetical - so testing focuses on whether external interfaces are isolated from safety-critical systems and whether the fleet-connected backend resists scaling attacks. Regulation - UNECE R155 / ISO 21434 - increasingly makes verifiable cybersecurity a condition of market entry. Detail below; the OT boundary echoes manufacturing OT.
// 01 Why connected vehicles are a safety-critical surface
Modern vehicles are effectively computers on wheels: dozens of networked electronic control units (ECUs), substantial software, and connections to the outside world through mobile networks, Wi-Fi, Bluetooth, companion mobile apps and cloud backends. That creates a large and safety-critical attack surface. Unlike most IT systems, a successful attack on a vehicle can affect physical safety - if an attacker can influence functions related to steering, braking or the engine - and can also compromise driver privacy and enable theft. And because vehicles are connected and remotely reachable, a vulnerability can potentially be exploited at scale across many vehicles at once. The combination - safety consequences, privacy exposure, remote reach, and a broad, complex attack surface - makes rigorous security testing essential, and it's increasingly demanded by regulation. This is the automotive counterpart to the safety-first mindset in manufacturing and other OT environments.
// 02 What gets tested - the whole ecosystem
In-vehicle networks & ECUs
The electronic control units and the buses connecting them inside the vehicle.
External interfaces
Mobile connectivity, Wi-Fi and Bluetooth - the vehicle's wireless doors to the outside.
Cloud backend & APIs
The backend and APIs the vehicle and apps talk to - the fleet-scale risk point.
Automotive testing spans the whole connected-vehicle ecosystem, not just the car. Testers look for ways to move from an external interface or remote service toward influencing the vehicle, for weaknesses in the backend that could affect many vehicles at once, and for flaws in the apps and communications that expose data or control. The goal: understand whether an attacker could compromise a vehicle remotely, affect safety-related functions, steal data, or scale an attack across a fleet.
// 03 Yes, cars can be hacked remotely
The concern is well founded, not hypothetical. Because connected vehicles communicate with backend services and are reachable through mobile networks and other wireless interfaces, vulnerabilities in those remote pathways can in principle let an attacker reach a vehicle without physical access. Security researchers have demonstrated remote compromises of vehicles in the past - a major reason the industry and regulators now take automotive cybersecurity so seriously. The most serious scenarios involve chaining a remote entry point through to functions that affect the vehicle, so testing pays particular attention to two things: whether external and remote interfaces are properly isolated from safety-critical systems (the automotive version of the IT/OT segmentation question), and whether the backend that connects to many vehicles is adequately protected against attacks that could scale across the fleet.
// 04 Regulation & how testing runs
Automotive cybersecurity is increasingly governed by dedicated regulation and standards. A prominent example is the UNECE regulation on vehicle cybersecurity (R155), which requires manufacturers to have a cybersecurity management system and to manage cyber risks across the vehicle lifecycle, and the associated engineering standard (ISO/SAE 21434) that defines how to build security into vehicle development. Together they push manufacturers and suppliers to identify and address cyber risks systematically, and security testing is part of how they demonstrate that vehicles and their supporting systems have been assessed. Organisations should confirm the specific obligations for their vehicles and markets, but the direction is clear: verifiable cybersecurity, supported by testing, is becoming a condition of bringing connected vehicles to market. An engagement is scoped across the ecosystem, weights the remote-to-safety and fleet-scale-backend scenarios, follows our methodology, and retests findings to closure. It draws on our mobile, API and OT/ICS testing practices in combination.
// 05 Frequently asked questions
Why do connected vehicles need testing?
Modern vehicles are computers on wheels - dozens of networked ECUs, substantial software, and connectivity via mobile networks, Wi-Fi, Bluetooth, companion apps and cloud backends - creating a large, safety-critical attack surface. Unlike most IT, an attack can affect physical safety (steering, braking, engine), compromise privacy and enable theft, and because vehicles are remotely reachable, a vulnerability can be exploited at scale across many vehicles. That combination makes rigorous testing essential, and regulation increasingly demands it.
What's tested in automotive pentesting?
The whole connected-vehicle ecosystem: in-vehicle networks, ECUs and the buses connecting them; external interfaces like mobile connectivity, Wi-Fi and Bluetooth; the companion mobile apps drivers use; and the cloud backend and APIs the vehicle and apps talk to. Testers look for ways to move from an external interface toward influencing the vehicle, backend weaknesses that could affect many vehicles at once, and app/communication flaws exposing data or control - assessing remote compromise, safety impact, data theft and fleet-scale attacks.
Can a car really be hacked remotely?
Yes - well founded, not hypothetical. Because connected vehicles communicate with backend services and are reachable through mobile networks and other wireless interfaces, vulnerabilities in those remote pathways can in principle let an attacker reach a vehicle without physical access, and researchers have demonstrated remote compromises. The most serious scenarios chain a remote entry point through to vehicle functions, so testing focuses on whether external interfaces are isolated from safety-critical systems and whether the fleet-connected backend resists attacks that could scale.
What regulations apply to automotive cybersecurity?
Increasingly, dedicated regulation and standards. A prominent example is the UNECE regulation on vehicle cybersecurity (R155), requiring manufacturers to have a cybersecurity management system and manage cyber risks across the vehicle lifecycle, plus the associated engineering standard (ISO/SAE 21434) for building security into development. Together they push systematic risk management, and testing is part of demonstrating vehicles and supporting systems have been assessed. Confirm the specific obligations for your vehicles and markets.
// 06 Related reading
- Manufacturing & OT — the shared IT/OT segmentation and safety mindset.
- OT / ICS testing, mobile app testing and API testing — the practices combined for automotive.
- Our methodology and retesting.