emqx/changes/ce/fix-13357.en.md

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Stop returning `CONNACK` or `DISCONNECT` to clients that sent malformed CONNECT packets.
- Only send `CONNACK` with reason code `frame_too_large` for MQTT-v5.0 when connecting if the protocol version field in CONNECT can be detected.
- Otherwise **DONOT** send any CONNACK or DISCONNECT packet.