Executive Summary

CVE-2026-28520 is a high-severity vulnerability in arduino-TuyaOpen versions before 1.2.1. It is caused by a single-byte buffer overflow in the WiFiMulti component due to an off-by-one error (CWE-193).

This vulnerability can be exploited when the affected smart hardware connects to an attacker-controlled WiFi access point (AP) hotspot. The attacker can then leverage the overflow to execute arbitrary code remotely on the embedded device.

The exploit requires no privileges, no user interaction, and no authentication, making it particularly dangerous.

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Impact Analysis

This vulnerability allows an attacker to execute arbitrary code remotely on the affected embedded device by tricking it into connecting to a malicious WiFi access point.

As a result, the attacker could take full control of the device, potentially leading to device malfunction, data theft, or using the device as a foothold for further attacks within a network.

Since the exploit requires no privileges or user interaction, it poses a significant security risk to users of vulnerable versions of arduino-TuyaOpen.

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Compliance Impact

I don't know

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Detection Guidance

I don't know

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Mitigation Strategies

To mitigate this vulnerability, immediately update arduino-TuyaOpen to version 1.2.1 or later, where the single-byte buffer overflow in the WiFiMulti component has been fixed.

Additionally, avoid connecting affected smart hardware to untrusted or attacker-controlled access point (AP) hotspots to reduce the risk of exploitation.

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