Zero-Day Advisory

Fortinet Discovers Abbott FreeStyle Libre Sensor Weak Data Integrity Protection Vulnerability


Fortinet's FortiGuard Labs has discovered weak protection of data integrity in FreeStyle LibreLink sensors.

FreeStyle LibreLink sensor can help you monitor your glucose. You can monitor your glucose using the smartphone app FreeStyle LibreLink without fingersticks.

FreeStyle LibreLink sensor's memory, which contains glucose measures, sensor region, stage of life and other code, is protected by a checksum. An attacker can unlock the memory by exploiting other vulnerability like FG-VD-19-112, then modify data and recompute the CRC. The attack can be conducted over NFC. Thus, it requires close proximity to the 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 January 29, 2020. 

Abbott confirmed the vulnerability on  February 14, 2020. 


This vulnerability was discovered by Axelle Apvrille of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.