CVE-2026-20034: Cisco Unity Connection

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of a targeted device. To exploit this vulnerability, the attacker must have valid user credentials on the affected device.

Affected products

• Cisco Unity Connection: before 14.0 (fixed in 14.0); version 14.0 only; version 14su1 only; version 14su2 only; version 14su3 only; version 14su4 only; …

Published 2026-05-06. Last modified 2026-07-01.