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

Source

Associated Vulnerability

Description

CVE-2025-20354

Readme

# ⚔️ CVE-2025-20354 — Cisco Unified Contact Center Express (CCX) RCE Vulnerability

![Cisco UCCX Vulnerabilities Allow Remote Attackers to Execute Arbitrary Code (1)](https://github.com/user-attachments/assets/40a8ed88-7f6d-4ae3-936e-4a5ceb61b511)

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## 🔍 Overview

**CVE-2025-20354** is a **critical Remote Code Execution (RCE)** flaw in **Cisco Unified Contact Center Express (CCX)**.
It stems from **improper authentication** in the **Java Remote Method Invocation (RMI)** process, which allows **unauthenticated attackers** to upload and execute arbitrary files **with root privileges**.

> **Severity:** 9.8 / 10 (Critical)
> **Vector:** `AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
> **CWE:** 434 — *Unrestricted Upload of File with Dangerous Type*
> **Disclosure Date:** November 2025

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## 🧩 Affected Products

| Product                                    | Affected Versions         | Fixed In      |
| ------------------------------------------ | ------------------------- | ------------- |
| Cisco Unified Contact Center Express (CCX) | 12.5 SU3 ES07 and earlier | 12.5 SU3 ES08 |
| Cisco Unified Contact Center Express (CCX) | 15.0 before ES01          | 15.0 ES01     |

📦 **Impact:** Full system compromise — attacker gains root access remotely without credentials.

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## ⚙️ Technical Summary

* Vulnerability lies in the **RMI service** used for remote method calls.
* **No authentication or insufficient validation** on incoming requests allows arbitrary file uploads.
* Uploaded payloads can be executed as the **root user**.
* Exploitation requires **only network access** to the vulnerable service.

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## 🧰 Mitigation & Remediation

### ✅ Recommended Actions

1. **Patch Immediately**

   * Apply Cisco’s official updates for your CCX version.
   * [Cisco Security Advisory — CVE-2025-20354](https://nvd.nist.gov/vuln/detail/CVE-2025-20354)

2. **Restrict Access**

   * Block or isolate RMI interfaces from untrusted networks.
   * Use firewalls or ACLs to limit access to administrative IPs only.

3. **Monitor & Detect**

   * Watch for suspicious RMI traffic, file uploads, or new binaries in system directories.
   * Review logs for unexpected Java process executions.

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## 🚨 Why It Matters

💀 **Unauthenticated attacker** → No login needed
🧨 **Root privileges** → Complete system takeover
🌐 **Network exploitable** → Threats extend beyond internal networks

Because of these factors, this CVE is **one of the most critical in Cisco CCX history** and demands **urgent remediation**.

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## 🕵️‍♂️ Indicators of Compromise (IoCs)

* Unexpected `.jar` or `.class` files in CCX temp directories
* Outbound connections from CCX host to unknown IPs
* New or modified system binaries with Java metadata

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