CVE-2025-20354# ⚔️ CVE-2025-20354 — Cisco Unified Contact Center Express (CCX) RCE Vulnerability
---
## 🔍 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
---
## 🧩 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.
---
## ⚙️ 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.
---
## 🧰 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.
---
## 🚨 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**.
---
## 🕵️♂️ 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
---
登录后查看神龙缓存的 POC 文件快照
登录查看