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MELSEC-Q and MELSEC-L CPU Module FTP Server Vulnerability Technical Bulletin

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This technical bulletin details denial-of-service (DoS) vulnerabilities (CWE-400) in the FTP server function of specific MELSEC-Q and MELSEC-L CPU modules, which can prevent normal FTP client access. It provides recovery methods, user measures such as firewall installation, and describes a firmware fix that automatically disconnects idle FTP clients to enhance security.

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