Vulnerabilities stem from the SETracker application, developed by Chinese developer 3G Electronics. The app is available on iOS and Android and has been downloaded over 10 million times. It is used by elderly patients with dementia who need reminders for taking medication and to carry out everyday tasks. The issue allows an attacker who knows the device ID of the smartwatch to make a device call for any phone number or send SMS with any text from the watch, spy on any smartwatch, or fake a message from a parent to the smart watch.
Source: https://threatpost.com/smartwatch-hack-could-trick-dementia-patients-into-overdosing/157352/