CVE-2010-0591: Cisco Unified Communications Manager

High severity, CVSS 7.8. EPSS: 1.6% chance of exploitation in the next 30 days.

Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 6.x before 6.1(5), 7.x before 7.1(3b)SU2, and 8.x before 8.0(1) allows remote attackers to cause a denial of service (process failure) via a malformed SIP REG message, related to an overflow of the Telephone-URL field, aka Bug ID CSCtc62362.

Affected products

• Cisco Unified Communications Manager: version 6.0 only; version 6.0(1) only; version 6.0(1a) only; version 6.1 only; version 6.1(1) only; version 6.1(1a) only; …

Published 2010-03-05. Last modified 2026-06-16.