CVE-2008-4543: Cisco Unity

High severity, CVSS 7.1. EPSS: 1.8% chance of exploitation in the next 30 days.

Cisco Unity 4.x before 4.2(1)ES161, 5.x before 5.0(1)ES53, and 7.x before 7.0(2)ES8, when using anonymous authentication (aka native Unity authentication), allows remote attackers to cause a denial of service (session exhaustion) via a large number of connections.

Affected products

• Cisco Unity: up to and including 4.2\(1\); up to and including 5.0\(1\); up to and including 7.0\(2\); version 4.0 only; version 4.0(1) only; version 4.0(2) only; …

Published 2008-10-13. Last modified 2026-06-16.