Executive Summary

CVE-2026-28522 is a vulnerability in the arduino-TuyaOpen software before version 1.2.1. It is caused by a null pointer dereference in the WiFiUDP component.

An attacker on the same local area network can exploit this by sending a large volume of malicious UDP packets to the device. This causes memory exhaustion, which triggers the null pointer dereference and leads to a denial-of-service (DoS) condition.

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Impact Analysis

[{'type': 'paragraph', 'content': "This vulnerability can cause a denial-of-service condition on affected devices. An attacker on the same local network can send malicious UDP packets that exhaust the device's memory, causing it to crash or become unresponsive."}, {'type': 'paragraph', 'content': 'The impact is high on availability, meaning the device may stop functioning properly, which could disrupt any services or operations relying on it.'}] [1]

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Compliance Impact

I don't know

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Detection Guidance

This vulnerability can be detected by monitoring network traffic for an unusually large volume of UDP packets originating from devices on the same local area network. Such traffic patterns may indicate an attempt to exploit the null pointer dereference in the WiFiUDP component.

Commands to help detect this include using network monitoring tools or packet analyzers to filter and count UDP packets. For example, using tcpdump on a Linux system:

• tcpdump -i <interface> udp and src net <local_network>
• This command captures UDP packets from the local network interface, allowing you to observe if there is an abnormal volume of UDP traffic.

Additionally, you can use tools like Wireshark to analyze UDP traffic patterns for potential exploitation attempts.

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Mitigation Strategies

The immediate and recommended step to mitigate this vulnerability is to update the arduino-TuyaOpen software to version 1.2.1 or later, where the null pointer dereference issue in the WiFiUDP component has been fixed.

Until the update can be applied, consider restricting or monitoring UDP traffic on the local network to prevent an attacker from sending a large volume of malicious UDP packets to the device.

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