CVE-2026-5851 — AI Deep Analysis Summary

Q: What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: OS Command Injection in TOTOLINK A7100RU. 💥 **Consequences**: Attackers can execute arbitrary system commands, leading to total device compromise, data theft, and network disruption.

Q: Who is affected? (Versions/Components)

📦 **Vendor**: TOTOLINK (China). 📱 **Product**: A7100RU Wireless Router. 📅 **Affected Version**: 7.4cu.2313_b20191024. ⚠️ **Component**: CGI Handler (`cstecgi.cgi`).

Q: Is it fixed officially? (Patch/Mitigation)

🛠️ **Official Fix**: The data does not explicitly confirm a patched version is released yet (Published: 2026-04-09). 📝 **Status**: Refer to vendor advisories. Mitigation is recommended until a patch is available.

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, leading to total device compromise, data theft, and network disruption.

Q2Root Cause? (CWE/Flaw)

🛡️ **CWE-78**: Improper Neutralization of Special Elements used in an OS Command.…

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Q3Who is affected? (Versions/Components)

📦 **Vendor**: TOTOLINK (China). <br>📱 **Product**: A7100RU Wireless Router. <br>📅 **Affected Version**: 7.4cu.2313_b20191024. <br>⚠️ **Component**: CGI Handler (`cstecgi.cgi`).

Q4What can hackers do? (Privileges/Data)

👑 **Privileges**: High. The vulnerability allows execution with the privileges of the CGI process (often root or admin level on embedded devices).…

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Q5Is exploitation threshold high? (Auth/Config)

🔓 **Threshold**: LOW. <br>🌐 **Auth**: No authentication required (`PR:N`). <br>📡 **Access**: Network accessible (`AV:N`). <br>👤 **User Interaction**: None required (`UI:N`).…

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

📂 **Public Exploit**: Yes. <br>🔗 **Source**: GitHub repository `Litengzheng/vuldb_new` contains a README with exploit details.…

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Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: Scan for the specific CGI endpoint `/cgi-bin/cstecgi.cgi`.…

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Q8Is it fixed officially? (Patch/Mitigation)

🛠️ **Official Fix**: The data does not explicitly confirm a patched version is released yet (Published: 2026-04-09). <br>📝 **Status**: Refer to vendor advisories. Mitigation is recommended until a patch is available.

Q9What if no patch? (Workaround)

🚧 **Workaround**: <br>1. **Disable UPnP**: If possible, turn off UPnP features in the router settings. <br>2. **Network Segmentation**: Isolate the router from untrusted networks. <br>3.…

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Q10Is it urgent? (Priority Suggestion)

🔥 **Priority**: CRITICAL. <br>📊 **CVSS**: 9.8 (High). <br>⚡ **Urgency**: Immediate action required.…

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