CVE-2025-20354

CriticalCVSS 9.8

Published: 05/11/2025(UTC)Updated: 18/10/2026(UTC)Translated: 19/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Elevated risk

0.87%

58th percentile - higher than 58% of all known CVEs

Summary

A vulnerability in the Java RMI process of Cisco Unified CCX is due to improper authentication mechanisms associated with specific features. An unauthenticated remote attacker could upload a crafted file and execute arbitrary commands with root privileges.

Risk Assessment

Potential full compromise of the Unified CCX system with arbitrary code execution as root, leading to complete takeover of the telephony infrastructure.

Recommendation

Apply the Cisco security update for Unified CCX as soon as possible and restrict access to the Java RMI process from untrusted networks.

Other vulnerabilities in Cisco Unified CCX

CVE-2025-20358Critical
A vulnerability in the Contact Center Express (CCX) Editor application of Cisco Unified CCX could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative permissions for script creation and execution. This is due to improper authentication mechanisms in the communication between the CCX Editor and the Unified CCX server.

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS