CVE-2009-2052: Cisco Unified Communications Manager

High severity, CVSS 7.8. EPSS: 4% chance of exploitation in the next 30 days.

Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x, 5.x before 5.1(3g), 6.x before 6.1(4), 7.0 before 7.0(2), and 7.1 before 7.1(2); and Cisco Unified Presence 1.x, 6.x before 6.0(6), and 7.x before 7.0(4); allows remote attackers to cause a denial of service (TCP services outage) via a large number of TCP connections, related to "tracking of network connections," aka Bug IDs CSCsq22534 and CSCsw52371.

Affected products

• Cisco Unified Communications Manager: from 5.0, before 5.1\(3g\) (fixed in 5.1\(3g\)); from 6.1\(1\), before 6.1\(4\) (fixed in 6.1\(4\)); from 7.0, before 7.0\(2\) (fixed in 7.0\(2\)); from 7.1, before 7.1\(2\) (fixed in 7.1\(2\))

Published 2009-08-27. Last modified 2026-06-16.