Cisco IOS Measurement, Aggregation, and Correlation Engine Denial of Service Vulnerability

A vulnerability in the Measurement, Aggregation, and Correlation Engine (MACE) feature of Cisco IOS Software could allow an unauthenticated, remote attacker to cause an affected device to reload.

The vulnerability is due to a race condition between process switching and Cisco Express Forwarding switching in the Common Classification Engine (CCE) feature used by MACE. An attacker could exploit this vulnerability by sending crafted traffic to an affected router.

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

To exploit this vulnerability, an attacker may need access to trusted, internal networks behind a firewall to send crafted traffic to the targeted device. This access requirement may reduce the likelihood of a successful exploit.

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