The OTA firmware update mechanism in Netun Solutions HelpFlash IoT (firmware v18_178_221102_ASCII_PRO_1R5_50) uses hard-coded WiFi credentials identical across all devices and does not authenticate update servers or validate firmware signatures. An attacker with brief physical access can activate OTA mode (8-second button press), create a malicious WiFi AP using the known credentials, and serve malicious firmware via unauthenticated HTTP to achieve arbitrary code execution on this safety-critical emergency signaling device.
CVSS Details
- CVSS 3.1 Base Score: 6.6
- CVSS 3.1 Vector: (CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
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