CVE-2026-6156 — AI Deep Analysis Summary

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-78 (OS Command Injection). 🔍 **Flaw**: Improper handling of the `Comment` parameter in `/cgi-bin/cstecgi.cgi`. The input is not sanitized before being passed to the OS shell.

Q: Who is affected? (Versions/Components)

📦 **Affected Product**: TOTOLINK A7100RU Wireless Router. 📅 **Specific Version**: 7.4cu.2313_b20191024. ⚠️ **Vendor**: Totolink (China Jicong Electronics).

Q: Is there a public Exp? (PoC/Wild Exploitation)

📜 **Public Exploit**: Yes. 🔗 **Evidence**: GitHub repository `Litengzheng/vuldb_new` contains a README with exploit details. VDB-357036 provides technical descriptions. Wild exploitation is possible.

Q: Is it urgent? (Priority Suggestion)

🔴 **Urgency**: **CRITICAL**. 🚀 **Priority**: Immediate action required. High CVSS score (9.8 - H/H/H) + No Auth required + Public Exploit exists. Patch or isolate immediately to prevent total compromise.

Updated May 06, 2026 CVSS 9.8 · Critical

This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis →

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: OS Command Injection in TOTOLINK A7100RU. <br>🔥 **Consequences**: Attackers can execute arbitrary system commands on the router.…

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Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-78 (OS Command Injection). <br>🔍 **Flaw**: Improper handling of the `Comment` parameter in `/cgi-bin/cstecgi.cgi`. The input is not sanitized before being passed to the OS shell.

Q3Who is affected? (Versions/Components)

📦 **Affected Product**: TOTOLINK A7100RU Wireless Router. <br>📅 **Specific Version**: 7.4cu.2313_b20191024. <br>⚠️ **Vendor**: Totolink (China Jicong Electronics).

Q4What can hackers do? (Privileges/Data)

💀 **Privileges**: Likely **Root/System** level access due to the nature of CGI command injection in embedded devices.…

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Q5Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: **LOW**. <br>🔓 **Auth**: CVSS Vector indicates `PR:N` (Privileges Required: None). <br>🌐 **Access**: `AV:N` (Attack Vector: Network) and `AC:L` (Attack Complexity: Low).…

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Q6Is there a public Exp? (PoC/Wild Exploitation)

📜 **Public Exploit**: Yes. <br>🔗 **Evidence**: GitHub repository `Litengzheng/vuldb_new` contains a README with exploit details. VDB-357036 provides technical descriptions. Wild exploitation is possible.

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: Scan for the specific CGI endpoint `/cgi-bin/cstecgi.cgi`. <br>🧪 **Test**: Send crafted HTTP requests with malicious payloads in the `Comment` parameter.…

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Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Official Fix**: The data does not explicitly confirm a patched version is released. <br>📢 **Status**: Advisory published on 2026-04-13.…

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Q9What if no patch? (Workaround)

🚧 **Workaround**: <br>1. **Isolate**: Place the router in a DMZ or restrict management access to trusted IPs only. <br>2. **Disable**: If possible, disable remote management features. <br>3.…

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Q10Is it urgent? (Priority Suggestion)

🔴 **Urgency**: **CRITICAL**. <br>🚀 **Priority**: Immediate action required. High CVSS score (9.8 - H/H/H) + No Auth required + Public Exploit exists. Patch or isolate immediately to prevent total compromise.

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Vulnerability detail Full AI analysis (login) Totolink CWE-78