Cisco IOS XE Software is an operating system from the U.S. company Cisco (Cisco). A single operating system for enterprise wired and wireless access, aggregation, core and WAN, Cisco IOS XE reduces business and network complexity.Cisco IOS XE Software is vulnerable to an exploit that could be used by an attacker to send carefully crafted traffic to a target device to bypass the ALG and open a connection that is not allowed to connect to a remote device located behind the ALG .