Description
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; netun: helpflash iot
References2
- docs.espressif.com/projects/esp-idf/en/v4.3.2/ Product
- luismirandaacebedo.github.io/CVE-2025-65855/ Third Party Advisory
Metrics
- CVSS 3.1
-
6.6
MEDIUM
Score source: CNA
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 1 · as of 11 November 2026
- CWE
- CWE-319CWE-494CWE-798
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