Security researchers at **UC San Diego** have uncovered significant flaws in a widely installed aftermarket car alarm system, the **KARR Security System**. Their findings indicate that an estimated two million vehicles across the United States are vulnerable to remote exploitation. The vulnerabilities allow an attacker within **Bluetooth** range to send radio commands to affected vehicles. These commands can perform a range of malicious actions, including silently unlocking the car, deactivating its alarm, sounding the horn, or flashing the lights. Critically, the research also revealed the ability for an attacker to disable a vehicle's ignition, potentially leaving a driver stranded and creating a severe safety concern. This discovery highlights the growing cybersecurity risks associated with connected vehicles and aftermarket devices. The integration of wireless technologies, while offering convenience, introduces new attack surfaces that require robust security measures and diligent patching protocols. Vehicle owners with the **KARR Security System** are urged to contact their installers or manufacturers for information on available patches or mitigation strategies.