The risk of data theft via public USB ports exists, but there have been no reliable reports of successful attacks. However, users should still take some measures to protect their devices.

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Charging phones at public USB stations at airports is often warned of a potential security risk. The FBI and the US Transportation Security Administration (TSA) have advised passengers not to plug their phones directly into these ports. However, security experts say that the risk called "juice jacking" is being exaggerated compared to reality.

In March 2025, TSA advised passengers to bring chargers or spare batteries instead of using public USB ports. The US Federal Communications Commission (FCC) also warned about this form of attack, but later withdrew its notice when experts questioned its prevalence. In 2019, the Los Angeles District Attorney's Office also warned about juice jacking, but confirmed that no incidents had been recorded.

In theory, bad guys could interfere with the USB charging station to connect to the data transmission pin inside the cable, thereby installing malicious code or stealing information. In 2013, researchers at the Georgia Institute of Technology demonstrated a Mactans malicious charger prototype, capable of installing malicious code on iPhones running iOS 6.

Apple then enhances security with a "Trust This Computer?" when the phone connects to a new device that wants to access data. If this request appears from an unfamiliar device, users should select "Don't Trust", unless they really want to share data.

There are currently no reliable reports confirming a successful juice jacking attack. However, to minimize risks, users should prioritize spare batteries or separate chargers and cables plugged into a regular electrical outlet. Some charging stations have a "Secure" mode, which completely blocks data transfers, which is also a good choice.

If you must use a public USB port, you can equip a USB data blocker. This accessory allows power to pass through but prevents data connections to foreign devices. However, the USB-A type may cause fast charging to not work because the charger needs a data connection to regulate the voltage. The phone is still charged but it takes longer. This limitation does not apply to modern USB-C data blockers.

Additionally, users should avoid accessing sensitive information over public Wi-Fi, regularly update software, and enable multi-factor authentication (MFA) for important accounts. These measures help increase security when traveling as well as during daily device use.