CVE-2021-23241 — AI Deep Analysis Summary

🚨 **Essence**: Path Traversal in Mercusys Mercury X18G. <br>💥 **Consequences**: Attackers can traverse directories to access sensitive system files (e.g., `/etc/passwd`).…

🛡️ **Root Cause**: Improper input validation allowing `../` sequences. <br>🔍 **CWE**: Path Traversal (CWE-22).…

📦 **Affected Product**: Mercusys Mercury X18G Router. <br>🔢 **Version**: Specifically **1.0.5**. <br>🏢 **Vendor**: Mercusys (China). <br>⚠️ **Note**: Other versions may be vulnerable, but 1.0.5 is confirmed.

🕵️ **Hackers Can**: <br>1. Read `/etc/passwd` & `/etc/shadow`. <br>2. Bypass login screens using `loginLess` + `../`. <br>3. Access arbitrary local files on the router.…

🔓 **Threshold**: **LOW**. <br>🌐 **Auth**: No authentication required for the `loginLess` endpoint. <br>📡 **Config**: Remote exploitation possible if the web interface is exposed to the internet.…

📜 **Public Exp?**: **YES**. <br>🔗 **PoC**: Available via ProjectDiscovery Nuclei templates. <br>🧪 **Proof**: URI `/loginLess/../../etc/passwd` successfully returns file content.…

🔍 **Self-Check**: <br>1. Send GET request to `/loginLess/../../etc/passwd`. <br>2. Check response for Linux user data. <br>🛠️ **Tools**: Use Nuclei or Burp Suite.…

🩹 **Official Fix**: **Unknown/Not Specified** in data. <br>📅 **Published**: Jan 7, 2021. <br>🔗 **Ref**: Check Mercusys official site for firmware updates.…

🚧 **Workaround**: <br>1. **Disable** remote management interface. <br>2. **Block** port 80/443 from WAN if possible. <br>3. Change default admin passwords (though auth bypass exists, it limits lateral movement). <br>4.…

🔥 **Urgency**: **HIGH**. <br>⚡ **Reason**: No auth required + Public PoC + Critical Data Exposure. <br>📉 **Priority**: Patch immediately or isolate device. <br>🚨 **Risk**: High likelihood of automated botnet scanning.