Cisco Identity Services Engine RADIUS Service Denial of Service Vulnerability

A vulnerability in Cisco Identity Services Engine (ISE) could allow an authenticated, remote attacker to cause the affected system to stop processing Remote Authentication Dial-In User Service (RADIUS) packets.

The vulnerability is due to improper implementation of deadlock code when the system receives crafted RADIUS accounting packets from two different network access servers (NASs). An attacker could exploit this vulnerability by crafting RADIUS account packets and sending them to the affected system. An exploit could allow the attacker to cause the RADIUS process to become unresponsive, causing the affected system to stop processing RADIUS packets.

Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.

To exploit this vulnerability, an attacker must authenticate to an affected device. This access requirement decreases 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.