Fortinet Discovers Abbott FreeStyle Libre Sensor Unlock Code


Fortinet's FortiGuard Labs has discovered a NFC memory unlock code in certain Abbott FreeStyle Libre sensors.

The sensor's memory, which contains glucose measures, sensor region or other code, is normally locked in read-only state. Unlocking the sensor makes it possible to write the memory.

Note that the unlock command is communicated over NFC, thus requiring close proximity to an individual sensor.


This vulnerability has been addressed in FreeStyle Libre 14-day in the U.S (announced in August 2018), and FreeStyle Libre 2 outside the U.S (announced in October 2018).


Fortinet reported the vulnerability to Abbott on September 5, 2019.


This vulnerability was discovered by Travis Goodspeed, with help of Axelle Apvrille of Fortinet's FortiGuard Labs.

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