CVE-2025-20354 CRITICAL

CVE-2025-20354: Cisco Unified Contact Center Express Remote Code Execution Vulnerability

Vendor Cisco
Product Cisco Unified Contact Center Express
Weakness CWE-434 · Unrestricted file upload
Published November 5, 2025
Last update February 26, 2026

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

A vulnerability in the Java Remote Method Invocation (RMI) process of Cisco Unified CCX could allow an unauthenticated, remote attacker to upload arbitrary files and execute arbitrary commands with root permissions on an affected system. This vulnerability is due to improper authentication mechanisms that are associated to specific Cisco Unified CCX features. An attacker could exploit this vulnerability by uploading a crafted file to an affected system through the Java RMI process. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system and elevate privileges to root.

Key dates

02Disclosure timeline

November 5, 2025 CVE published
February 26, 2026 Record updated