CVE-2026-3301 — AI Deep Analysis Summary

🚨 **Essence**: OS Command Injection in TOTOLINK N300RH. 💥 **Consequences**: Attackers can execute arbitrary system commands, leading to full device compromise and potential network takeover.

🛡️ **Root Cause**: CWE-78 (OS Command Injection). 🐛 **Flaw**: Improper handling of the `webWlanIdx` parameter in the `setWebWlanIdx` function within `/cgi-bin/cstecgi.cgi`.

📦 **Affected**: TOTOLINK N300RH Router. 📅 **Version**: Firmware 6.1c.1353_B20190305. 🏢 **Vendor**: Totolink (China Jicong Electronics).

👑 **Privileges**: High (Root/System level). 📊 **Data**: Full Control (C:H, I:H, A:H). Attackers gain complete read/write/execute access to the underlying OS.

⚠️ **Threshold**: Low. 🌐 **Auth**: None required (PR:N). 📡 **Access**: Network (AV:N). 🎯 **Complexity**: Low (AC:L). No user interaction needed (UI:N).

🔓 **Public Exp**: Yes. 📂 **Source**: GitHub (xyh4ck/iot_poc). 📝 **Details**: Specific PoC available for `setWebWlanIdx` RCE. Wild exploitation risk is high.

🔍 **Check**: Scan for `/cgi-bin/cstecgi.cgi`. 📡 **Probe**: Send crafted requests to `setWebWlanIdx` with malicious `webWlanIdx` values. 🛠️ **Tools**: Use existing GitHub PoC scripts for verification.

🔄 **Patch**: Check vendor site. 📉 **Mitigation**: If no patch, disable remote management. 🚫 **Block**: Restrict access to the Web Management Interface via firewall rules.

🛑 **Workaround**: Disable the Web Management Interface entirely if not needed. 🔒 **Network Segmentation**: Isolate IoT devices from critical network segments. 🚫 **Access Control**: Limit CGI access to trusted IPs only.

🔥 **Urgency**: Critical. 📅 **Published**: 2026-02-27. 🚨 **Risk**: CVSS 9.8 (Critical). Immediate action required due to low exploitation barrier and high impact.