OTPulse

Fourth Frontier Frontier X Mobile Application, Frontier X2

Plan PatchCVSS 8.8ICS-CERT ICSMA-26-148-01May 28, 2026
Attack path
Attack VectorAdjacent
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

Fourth Frontier Frontier X and Frontier X2 mobile medical applications contain a vulnerability that allows unauthenticated attackers on the same local network to read and write arbitrary device handle values. Successful exploitation could allow an attacker to modify clinical readings, take control of the device, and potentially cause patient harm. The vulnerability affects Frontier X Android app versions before 15.0.0, Frontier X iOS app versions before 25.0.0, and all versions of Frontier X2. Fourth Frontier is working on a fix; users should contact the vendor directly for assistance.

What this means
What could happen
An attacker with access to the same wireless network could read and modify medical device readings or execute commands on the Frontier X/X2 device, potentially altering patient vital signs data or disabling device functionality.
Who's at risk
Healthcare organizations and clinics using Fourth Frontier Frontier X or Frontier X2 mobile medical devices for patient monitoring. Affects both Android and iOS app users managing connected wearable or portable monitoring equipment.
How it could be exploited
An attacker on the same local network (Wi-Fi or Bluetooth range) can send unauthenticated commands to the Frontier X/X2 device to read and write arbitrary handle values. This allows modification of clinical readings or device state without requiring user interaction or credentials.
Prerequisites
  • Local network access (Wi-Fi or Bluetooth range to device)
  • No authentication or credentials required
  • Device must be powered on and in communication range
remotely exploitable (via local network/Bluetooth)no authentication requiredlow complexity attackaffects patient monitoring/safety systemsvendor fix not yet available
Exploitability
Unlikely to be exploited — EPSS score 0.0%
Affected products (3)
3 pending
ProductAffected VersionsFix Status
Frontier X Android application<v15.0.0No fix yet
Frontier X IOS application<v25.0.0No fix yet
Frontier X2All versionsNo fix yet
Remediation & Mitigation
0/4
Do now
0/3
HOTFIXContact Fourth Frontier directly for patch availability and timeline via https://fourthfrontier.com/pages/contact-us
WORKAROUNDRestrict Bluetooth and Wi-Fi connectivity: configure devices to connect only to private, secured networks; disable Wi-Fi when not in use
HARDENINGEnsure only one Frontier X app instance is connected to each device at a time to prevent unauthorized access attempts
Long-term hardening
0/1
HARDENINGImplement network segmentation to isolate medical devices from general patient/public networks and restrict physical location access to authorized clinical staff only
View full CISA ICS-CERT advisory
API: /api/v1/advisories/607f0c71-0a3a-4c85-9c0c-0bfcebc6e912

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