A vulnerability in Security Group Tag Exchange Protocol (SXP) in Cisco IOS Software Cisco IOS XE Software and Cisco NX-OS Software could allow an unauthenticated remote attacker to cause the affected device to reload resulting in a denial of service (DoS) condition. The vulnerability exists because crafted SXP packets are mishandled. An attacker could exploit this vulnerability by sending specifically crafted SXP packets to the affected device. A successful exploit could allow the attacker to cause the affected device to reload resulting in a DoS condition.