Critical: This vulnerability is rated as critical. This is a Cisco Security Advisory for a Cisco IOS XE Software Authentication, Authorization, and Accounting Login Authentication Remote Code Execution Vulnerability. The CVE ID for this vulnerability is CVE-2018-0315. It was first published on 2018 June 6 and last updated on 2018 June 8. The CVSS Score is 9.8. The vulnerability allows an unauthenticated, remote attacker to execute arbitrary code on an affected device or cause an affected device to reload, resulting in a denial of service (DoS) condition. The issue is due to incorrect memory operations when the software parses a username during login authentication. Cisco has released software updates that address this vulnerability, and there are no workarounds. This vulnerability affects Cisco devices running Cisco IOS XE Software Release Fuji 16.7.1 or Fuji 16.8.1, and configured to use AAA for login authentication.