CVE-2025-65855: Netun Helpflash IoT Firmware

Medium severity, CVSS 6.6. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Netun Helpflash IoT Firmware: version 18_178_221102_ascii_pro_1r5_50 only

Published 2025-12-17. Last modified 2026-06-17.