Cisco IOS and Cisco IOS XE Software are both products of Cisco, a U.S. company. cisco IOS is a set of operating systems developed for its network devices. cisco IOS XE Software is an operating system for enterprise wired and wireless access, aggregation, core, and WAN in a single operating system. Cisco IOS XE reduces business and network complexity. cisco ios and cisco ios xe have a resource management error vulnerability, which stems from improper handling of resources under abnormal conditions and can be exploited by an attacker to cause a denial of service.