Cisco IOS Shell Denial of Service Vulnerability

A vulnerability in the Cisco IOS Shell could allow an authenticated, but unprivileged, local user to crash the device.

The vulnerability is due to improper processing of IOS Shell commands. An attacker could repeatedly exploit this vulnerability to cause an extended denial of service.

Cisco has confirmed the vulnerability in a security notice and released software updates.

To exploit this vulnerability, an attacker must authenticate and have local access to the targeted device. These access requirements may reduce the likelihood of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.