CVE-2025-20276: Cisco Unified Contact Center Express

High severity, CVSS 7.2. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability in the web-based management interface of Cisco Unified CCX could allow an authenticated, remote attacker to execute arbitrary code on an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials.  This vulnerability is due to insecure deserialization of Java objects by the affected software. An attacker could exploit this vulnerability by sending a crafted Java object to an affected device. A successful exploit could allow the attacker to execute arbitrary code on the underlying operating system of an affected device as a low-privilege user. A successful exploit could also allow the attacker to undertake further actions to elevate their privileges to root.

Affected products

• Cisco Unified Contact Center Express: version 8.5(1) only; version 9.0(2)su3es04 only; version 10.0(1)su1 only; version 10.0(1)su1es04 only; version 10.5(1) only; version 10.5(1)su1 only; …

Published 2025-06-04. Last modified 2026-06-17.