Cisco IOS XE Software is prone to a security-bypass vulnerability.
An attacker can exploit this issue to bypass the authentication mechanism and gain unauthorized access. This may lead to further attacks.
This issue is tracked by Cisco Bug ID CSCve89880.
Information
Cisco 4400 Series Integrated Services Router Everest-16.5.1
Cisco 4400 Series Integrated Services Router 16.5.1
Exploit
Attackers can use readily available tools to exploit this issue.