CVE-2020-2551# 🌐 **CVE-2020-2551** Unauthenticated RCE in Oracle WebLogic Server via IIOP
<img width="900" height="500" alt="t01870efe86826eb5bc" src="https://github.com/user-attachments/assets/b3685cde-d5c3-41da-98c4-353099752b36" />
> **"A single IIOP packet can own your WebLogic server."**
> — *Security Researcher, 2020*
---
## 🎯 **Vulnerability Snapshot**
| **Attribute** | **Details** |
|---------------------------|-----------------------------------------------------------------------------|
| **CVE ID** | `CVE-2020-2551` |
| **Published** | January 15, 2020 |
| **CVSS v3.1** | **9.8 (Critical)** |
| **Vector** | `AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` |
| **Component** | WLS Core – IIOP (T3/IIOP Listener) |
| **Exploitability** | Public PoCs, Actively Exploited in the Wild |
| **Patch** | Oracle January 2020 CPU |
---
```mermaid
graph TD
subgraph "CVE-2020-2551: WebLogic IIOP RCE"
A[🌐 **CVE-2020-2551**] --> B{Unauthenticated<br>Network Attack}
B -->|IIOP Request| C[📦 Malicious JNDI Payload]
C --> D[🔓 Insecure Deserialization]
D --> E[⚡ Remote Code Execution]
E --> F[🏴☠️ Full Server Compromise]
style A fill:#ff4d4d,stroke:#cc0000,color:#fff
style B fill:#ff9966,stroke:#cc4400
style C fill:#ffcc00,stroke:#cc9900
style D fill:#ff6666,stroke:#cc3333
style E fill:#cc0000,stroke:#990000,color:#fff
style F fill:#330000,stroke:#660000,color:#ffcccc
end
subgraph "Impact & CVSS"
G[CVSS 9.8<br>🔥 Critical]
H[Confidentiality: High]
I[Integrity: High]
J[Availability: High]
G --> H & I & J
style G fill:#cc0000,stroke:#990000,color:#fff
style H fill:#ff4d4d,stroke:#cc0000,color:#fff
style I fill:#ff4d4d,stroke:#cc0000,color:#fff
style J fill:#ff4d4d,stroke:#cc0000,color:#fff
end
subgraph "Exploitation Flow"
K[1. Craft IIOP Packet] --> L[2. Trigger JtaTransactionManager]
L --> M[3. JNDI Lookup to Attacker LDAP]
M --> N[4. Load Malicious Class]
N --> O[5. Execute Payload]
style K fill:#1a1a1a,stroke:#00ff00,color:#00ff00
style L fill:#1a1a1a,stroke:#00ff00,color:#00ff00
style M fill:#1a1a1a,stroke:#00ff00,color:#00ff00
style N fill:#1a1a1a,stroke:#00ff00,color:#00ff00
style O fill:#1a1a1a,stroke:#00ff00,color:#00ff00
end
A --> G
A --> K
```
---
## 🛡️ **Remediation Checklist**
```diff
+ [ ] Apply Oracle January 2020 Critical Patch Update
+ [ ] Disable IIOP if unused: -Dweblogic.iiop.enable=false
+ [ ] Block T3/IIOP ports (7001, 7002) from internet
+ [ ] Enable Java Deserialization Filter (JEP 290)
+ [ ] Upgrade to WebLogic 14.1.1+ (supported as of 2025)
- [ ] Unpatched 10.3.6 / 12.1.3 instances in production
```
---
## 📡 **Detection Signatures**
```yaml
# Example: Snort / Suricata Rule
alert tcp any any -> $HOME_NET 7001:7002 (msg:"CVE-2020-2551 WebLogic IIOP RCE Attempt";
content:"|49 49 4f 50|"; depth:4; # IIOP Magic
content:"JtaTransactionManager"; distance:0;
classtype:attempted-admin; sid:1000001; rev:1;)
```
<img width="1920" height="958" alt="CVE-2020-2551" src="https://github.com/user-attachments/assets/aeb4bca7-053e-47c8-a3f9-17dfc7c50039" />
---
## 🔗 **Key References**
| Source | Link |
|-------|------|
| **NVD** | [nvd.nist.gov/vuln/detail/CVE-2020-2551](https://nvd.nist.gov/vuln/detail/CVE-2020-2551) |
| **Oracle CPU** | [oracle.com/security-alerts/cpujan2020.html](https://www.oracle.com/security-alerts/cpujan2020.html) |
| **PoC (GitHub)** | [github.com/jas502n/CVE-2020-2551](https://github.com/jas502n/CVE-2020-2551) |
| **Technical Writeup** | [medium.com/@qazbnm456/cve-2020-2551](https://medium.com/@qazbnm456/cve-2020-2551-unauthenticated-remote-code-execution-in-iiop-protocol-via-malicious-jndi-lookup-119bac7c1eb2) |
---
> **🛑 Legacy WebLogic systems remain prime targets in 2025.**
> **Patch now or become a statistic.**
---
*Styled with clarity, urgency, and visual hierarchy for security teams, CISOs, and developers.*
*Built for Markdown, Mermaid, and terminal-friendly rendering.*
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