The issue is related to a Heap-based Buffer Overflow that occurs when handling a long ZCL string during the commissioning phase, resulting in remote code execution. This can be exploited using a malicious ZigBee lightbulb to infiltrate a home IoT network. The flaw could allow remote attackers to gain access to the entire WiFi network over-the-air without cracking the password and launch further attacks against other devices connected to the same network.