CVE-2009-2053: Cisco Unified Communications Manager

High severity, CVSS 7.8. EPSS: 3.4% 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(2a)su1, and 7.1 before 7.1(2) allows remote attackers to cause a denial of service (file-descriptor exhaustion and SCCP outage) via a flood of TCP packets, aka Bug ID CSCsx32236.

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\(2a\)su1 (fixed in 7.0\(2a\)su1); from 7.1, before 7.1\(2\) (fixed in 7.1\(2\))

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