CVE-2025-20354CWE-434unrestricted-file-upload

CVE-2025-20354

Critical · published November 5, 2025

CVSS v3.1
9.8
EPSS
1%
Percentile
58.4
In the wild
Unconfirmed
What it is

🚨 A sneaky flaw in Cisco's Java RMI could turn your system into a playground for attackers! 🔥 Imagine a building with a hidden entrance that allows anyone to walk in and access the entire floor. This vulnerability lets attackers upload malicious files and exert control as if they were the building manager, bypassing all security checks! An attacker could stroll in through this backdoor, uploading arbitrary files and executing commands with root permissions — effectively taking over your system! This could lead to data breaches, system instability, and even complete control of sensitive environments. The consequences are absolutely devastating!

Put simply

Imagine a building with a hidden entrance that allows anyone to walk in and access the entire floor. This vulnerability lets attackers upload malicious files and exert control as if they were the building manager, bypassing all security checks! This vulnerability stems from improper authentication within Cisco Unified CCX's Java RMI process, allowing unauthenticated users to upload crafted files and execute commands with elevated privileges.

What to do

An attacker could stroll in through this backdoor, uploading arbitrary files and executing commands with root permissions — effectively taking over your system! This could lead to data breaches, system instability, and even complete control of sensitive environments. The consequences are absolutely devastating! Immediately patch your Cisco Unified CCX to the latest version to close this critical security gap. Review your authentication mechanisms to ensure they are robust and properly enforced. Conduct a thorough audit to identify any unusual activities or files that may have been uploaded! You've got this! With a few swift actions, your system will be protected! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00869 · 58.4th percentile
Weakness
CWE-434 · Unrestricted Upload of File with Dangerous Type
Published
2025-11-05T22:15Z
Affected products (2)
ProductVersionsFixed in
cisco/unified_contact_center_express< 12.5\(1\)_su03_es0712.5\(1\)_su03_es07
cisco/unified_contact_center_expressall versions—
References (1)
EPSS history
Timeline
  • 05 NOV 16:31Z
    Cisco Unified Contact Center Express Remote Code Execution Vulnerability
    cvelistv5