Cisco UCCX Vulnerability (CVE-2025-20354)

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Cisco UCCX Vulnerability (CVE-2025-20354)

Cisco recently patched a critical vulnerability in its Unified Contact Center Express (UCCX) software that could allow unauthenticated remote attackers to execute arbitrary commands with root privileges on affected systems.

 

How the Exploit Works

There are two major flaws involved:

1.            CVE-2025-20354 – Java RMI Remote Code Execution

•             Component Affected: Java Remote Method Invocation (RMI) process in Cisco UCCX.

•             Root Cause: Improper authentication mechanisms tied to specific UCCX features.

•             Exploit Method: An attacker can upload a crafted file via the Java RMI interface.

•             Impact: The file allows execution of arbitrary commands on the underlying OS with root-level access.

2.            CVE-2025-20358 – CCX Editor Authentication Bypass

•             Component Affected: Cisco CCX Editor application.

•             Exploit Method: Redirects authentication flow to a malicious server, tricking the app into thinking authentication succeeded.

•             Impact: Allows creation and execution of arbitrary scripts with admin permission.

 

Affected Versions and Fixes

12.5 SU3 and 15.0

No work around exists currently, only upgrading to the patched version mitigates the risk.

Real-World Risk

  • These vulnerabilities affect all configurations of Cisco UCCX.
  • As of now, no public exploit code has been found, and there are no reports of active exploitation in the wild.
  • However, the CVSS score is 9.8, indicating a high likelihood of exploitation if left unpatched.
Attack flow summary. 

[Attacker]
     ↓
[Java RMI Interface on Cisco UCCX]
     ↓
[Upload Crafted .jar File]
     ↓
[Authentication Bypass via RMI]
     ↓
[Execute Arbitrary Commands]
     ↓
[Root Shell Access on UCCX Server]

  • Detection Rule 
alert tcp $EXTERNAL_NET any -> $HOME_NET 1099 (msg:"Cisco UCCX RMI Exploit Attempt - CVE-2025-20354"; flow:to_server,established; content:"java.rmi"; nocase; content:"UnicastRef"; nocase; threshold:type limit, track by_src, count 1, seconds 60; classtype:attempted-admin; sid:2025203541; rev:1;)

Additional Indicators of Compromise (IoCs)

  • Unexpected .jar or .class files in /tmp or UCCX directories
  • Outbound connections from UCCX host to unknown IPs
  • New or modified binaries with Java metadata
  • Java process spawning shell commands (/bin/sh, bash, etc.)


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