MELSEC-Q QJ71E71-100 Ethernet Interface Module Vulnerability Technical Bulletin

This technical bulletin details vulnerabilities in MELSEC-Q series Ethernet interface modules, specifically the QJ71E71-100, where sending a TCP packet with an FTP login name exceeding 155 characters can cause system errors and communication termination. It advises users to limit FTP login names to 12 characters, install firewalls, and check for Internet connectivity, while noting that modules with serial numbers starting "20122" or later include enhanced security measures.