A stack-based buffer overflow in Fortinet FortiOS version 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, 6.0 all versions allows attacker to execute unauthorized code or commands via specially crafted commands