CVE-2021-31630 — AI Deep Analysis Summary

🚨 **Essence**: OpenPLC v3 has a **Code Injection** flaw in its web service. 📉 **Consequences**: Attackers can execute **system commands** remotely, leading to full device compromise. 💥

🛡️ **Root Cause**: The **Hardware Layer Code Box** on the `/hardware` page fails to filter **special characters** in user input. ⚠️ This allows malicious code injection directly into the system.

🏭 **Affected**: **OpenPLC v3** (Open Programmable Logic Controller). 📦 Specifically the **Web Server** component handling hardware layer configurations. 📅 Published: Aug 2021.

🕵️ **Hacker Capabilities**: Full **Remote Code Execution (RCE)**. 🖥️ Can run arbitrary system commands, upload C code, and spawn **reverse shells**. 🔓 No data exfiltration limit; total control.

🔑 **Threshold**: **Medium**. ⚠️ Requires **Authentication** (Username/Password). 🚫 Not fully unauthenticated, but default creds (openplc/openplc) are common in IoT/OT environments. 📉

💣 **Public Exp**: **YES**. 📂 Multiple PoCs on GitHub (e.g., `CVE-2021-31630-OpenPLC_RCE`). 🛠️ Scripts available for **Hack The Box** and direct RCE. 🌐 Wild exploitation is possible.

🔍 **Self-Check**: Scan for **OpenPLC WebServer v3**. 🕵️ Look for the `/hardware` endpoint. 🧪 Test with input containing special characters to see if command injection occurs. 📡 Use Nmap scripts if available.

🩹 **Official Fix**: Data does not list a specific vendor patch link. 📝 However, the vulnerability is well-documented. 🔄 Users should update to patched versions if available or apply mitigations immediately. ⏳

🛡️ **No Patch Workaround**: **Restrict Access**. 🚫 Block port 8080 from public internet. 🔒 Enforce **strong, unique passwords**. 🧹 Remove default credentials. 🛑 Disable unnecessary web services.

🔥 **Urgency**: **HIGH**. 🚨 RCE in industrial controllers (OT) is critical. ⚡ Even with auth, default creds are rampant. 🏭 Immediate isolation and patching required to prevent industrial sabotage.