A vulnerability in device authentication of Cisco Unified Communications Manager (CUCM) could allow an unauthenticated, remote attacker to impact application response. The vulnerability is due to incomplete throttling of authentication requests. An attacker could exploit this vulnerability by sending multiple authentication requests in a short period of time. An exploit could allow the attacker to degrade the performance of the CUCM application. Cisco has confirmed the vulnerability in a security notice and has released software updates. To exploit this vulnerability, an attacker may require access to a trusted, internal network to send authentication requests to the targeted system. This access requirement could limit the likelihood of a successful exploit. Customers are advised to review the bug report in the "Vendor Announcements" section for a current list of affected versions.
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-May-15 |
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