Malicious SIM cards can issue modem commands and take over cellular IoT
Source headline: A Malicious SIM Card Can Run Attacker Code Inside the Modems Behind Cellular IoT Devices
Intelligence Summary
Researchers tested whether a rogue SIM could remotely control devices through built-in cellular modems. The work focused on cellular modules and phones, demonstrating that attacker-issued SIM instructions can trigger device command execution. Because many chargers, industrial routers, and vehicle telematics units rely on similar cellular modems, the impact can extend to full device compromise. The risk is especially serious for unattended IoT equipment that trusts the cellular identity layer. Owners and operators should review SIM and modem trust boundaries, restrict modem command pathways, and monitor for anomalous modem behavior.
Recommended Action
Review affected assets, schedule urgent remediation, and monitor related indicators.