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A Malicious SIM Card Can Run Attacker Code Inside the Modems Behind Cellular IoT Devices

thehackernews.com 2026-08-11 AI supply chain Medium

What Happened

A malicious SIM card can order the device it sits in to run commands of the attacker's choosing. On the cellular modules built into electric-vehicle chargers, industrial routers, and car telematics units, that is enough to take the whole device over. Researchers at the University of Birmingham and the security firm Fuzzware tested 26 phones and cellular modules for the capability, found it

Why It Matters

The report says researchers showed that a malicious or compromised SIM card can use exposed SIM Toolkit/Proactive SIM interfaces to send commands into a device modem, affecting some phones and cellular IoT modules; they tested 26 devices and found the capability enabled in 9, including a real-world EV charger demo. The article also states the issue is tracked as CVE-2026-57550 / CVD-2026-0122 and can lead to actions such as command execution, data exposure, downgrade attacks, denial of service, and disabling cellular connectivity. RealGround analysis: this is best classified as an AI supply chain risk only if the affected cellular modules, SIM/eSIM provisioning, or device management layer is part of an AI-enabled product stack; otherwise it is primarily a cellular/IoT embedded-security issue rather than an AI-specific one.

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RealGround Analysis

This signal maps to AI supply chain. Organizations using AI agents, LLM APIs, SaaS integrations, or sensitive data workflows should review whether this class of issue could create unauthorized tool execution, data leakage, weak approval gates, or unmanaged supply-chain exposure.

Recommended Actions

  • Restrict AI agent tool permissions and production write paths.
  • Review sensitive data access across prompts, logs, embeddings, memory, and SaaS integrations.
  • Add human approval workflows for high-impact or state-changing actions.
  • Run prompt injection and indirect prompt injection tests against affected workflows.
  • Document the owner, control gap, and remediation deadline for this risk class.

Source

https://thehackernews.com/2026/08/a-malicious-sim-card-can-run-attacker.html

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