An issue was discovered on V-SOL V1600D V2.03.69 and V2.03.57 V1600D4L V1.01.49 V1600D-MINI V1.01.48 V1600G1 V2.0.7 and V1.9.7 and V1600G2 V1.1.4 OLT devices. Command injection can occur in \upload tftp syslog\ and \upload tftp configuration\ in the CLI via a crafted filename.