Netun HelpFlash IoT 18_178_221102_ASCII_PRO_1R5_50 OTA Firmware Update code download

Summaryinfo

A vulnerability classified as problematic has been found in Netun HelpFlash IoT 18_178_221102_ASCII_PRO_1R5_50. This affects an unknown function of the component OTA Firmware Update. Performing a manipulation results in code download. This vulnerability was named CVE-2025-65855. The attack may be carried out on the physical device. There is no available exploit.

Detailsinfo

A vulnerability was found in Netun HelpFlash IoT 18_178_221102_ASCII_PRO_1R5_50. It has been classified as critical. This affects some unknown processing of the component OTA Firmware Update. The manipulation with an unknown input leads to a code download vulnerability. CWE is classifying the issue as CWE-494. The product downloads source code or an executable from a remote location and executes the code without sufficiently verifying the origin and integrity of the code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at docs.espressif.com. This vulnerability is uniquely identified as CVE-2025-65855 since 11/18/2025. The exploitability is told to be difficult. An attack has to be approached locally. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1495 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-203902). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Netun

Name

• HelpFlash IoT

Version

• 18_178_221102_ASCII_PRO_1R5_50

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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