CVE-2021-20124 — AI Deep Analysis Summary

🚨 **Essence**: Path Traversal in Draytek VigorConnect. The WebServlet file download feature fails to sanitize inputs.…

🛡️ **Root Cause**: Improper Input Validation. The application does not effectively handle high-privilege files during the download process.…

📦 **Affected Product**: Draytek VigorConnect. 📌 **Specific Version**: **1.6.0-B3**. This is a centralized management system for DrayTek products. If you are running this specific build, you are at risk.

💀 **Attacker Capabilities**: Unauthenticated access allows downloading **arbitrary files** from the OS. 🗝️ **Privilege Level**: Files are downloaded with **root privileges**.…

⚡ **Exploitation Threshold**: **LOW**. No authentication is required. An unauthenticated attacker can leverage this directly. No special configuration or complex setup is needed to trigger the vulnerability.

🔓 **Public Exploit**: **YES**. A Proof of Concept (PoC) is available via **Nuclei Templates** on GitHub. This makes automated scanning and widespread exploitation highly likely and easy to execute.

🔍 **Self-Check**: Use security scanners like **Nuclei** with the specific CVE-2021-20124 template. Look for the WebServlet file download endpoint.…

🩹 **Official Fix**: The data indicates the vulnerability was published in Oct 2021. While a specific patch link isn't in the snippet, vendors typically release updates for such critical LFI flaws.…

🚧 **No Patch Workaround**: 1. **Block Access**: Restrict access to the VigorConnect web interface via Firewall/ACLs. 2. **Disable Service**: If not needed, disable the WebServlet or the management service entirely. 3.…

🔥 **Urgency**: **CRITICAL**. Since it requires **no auth** and grants **root-level file access**, this is a high-priority fix.…