A vulnerability in the Link Layer Discovery Protocol (LLDP) feature could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This issue is due to insufficient resource allocation and errors in memory deallocation. An attacker could exploit this by sending crafted LLDP traffic to an affected device, potentially exhausting the memory resources and causing the LLDP process to crash. If the device is configured to support LLDP only, this could interrupt inbound and outbound calling. By default, these devices support both Cisco Discovery Protocol and LLDP.