A vulnerability in the supervisor of the Cisco MDS Family could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to improper handling of Virtual Router Redundancy Protocol (VRRP) frames. An attacker could exploit this vulnerability by sending a VRRP frame with Authentication Header (AH) authentication. An exploit could allow an attacker to drive CPU utilization over 90 percent, causing the supervisor to be slow to respond. The CPU does not recover until the VRRP service is restarted via a system switchover or restart. Cisco has confirmed the vulnerability in a security notice and released software updates. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
| Version | Description | Section | Status | Date |
| 1.0 | Initial Release | NA | Final | 2013-Nov-06 |
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