Subscriber Identity Modules (SIMs), secure elements used to connect devices to a mobile network, can pose severe security risks when compromised. A malicious SIM could allow attackers to gather information about a device, interfere with its connectivity and serve as an entry point for further cyberattacks.
Presenting their findings at the 2026 USENIX WOOT Conference on Offensive Technologies in Baltimore, University of Birmingham researchers reveal a new attack surface exposed to malicious and compromised SIMs.
A feature known as Proactive SIM allows a SIM card to send a limited number of special commands directly to a device’s modem...
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