A vulnerability in the Intercluster Sync Agent Service on Cisco Unified Presence Server could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. The vulnerability is due to a SYN flood. An attacker could exploit this vulnerability by exceeding the tcp max connections parameter. Cisco has confirmed the vulnerability in a security notice; however, software updates are not available. To exploit this vulnerability, an attacker must be in a position to send large amounts of SYN packets to the targeted device. In a typical enterprise network, the targeted device may reside on trusted, internal networks behind a firewall, which may reduce the possibility of an external attack. 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 | 2014-Jul-28 |
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