CVE-2026-7138 — AI Deep Analysis Summary

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-78 (OS Command Injection). 🐛 **Flaw**: The `setNtpCfg` function in `/cgi-bin/cstecgi.cgi` fails to sanitize the `tz` (timezone) parameter. Malicious input is passed directly to the OS shell.

Q: Who is affected? (Versions/Components)

🎯 **Affected Product**: TOTOLINK A8000RU Wireless Router. 📦 **Specific Version**: Firmware `7.1cu.643_b20200521`. ⚠️ **Component**: CGI Handler (`cstecgi.cgi`).

Q: Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: LOW. 🌐 **Access**: Network Accessible (AV:N). 🔓 **Auth**: None Required (PR:N). 🖱️ **UI**: None Required (UI:N). 📊 **Complexity**: Low (AC:L). Easy to exploit remotely.

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

🔍 **Public Exploit**: Yes. 📂 **Source**: GitHub PoC available (`Litengzheng/vuldb_new2`). 📝 **Details**: VDB-359737 contains technical descriptions and indicators. Wild exploitation is highly probable given low barrier.

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

🛠️ **Official Fix**: Check TOTOLINK website. 📅 **Date**: Published 2026-04-27. ⚠️ **Note**: Data does not confirm a specific patch release date yet, but vendor advisory exists. Update firmware immediately if available.

Q: What if no patch? (Workaround)

🚧 **Workaround**: Block external access to the router's management interface (Port 80/443). 🚫 **Filter**: Restrict CGI access to LAN only. 🛑 **Disable**: If possible, disable remote management features entirely.

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: CRITICAL. 🚨 **Priority**: P1. CVSS Score is High (9.8+ implied by vector). Immediate action required: Patch or isolate. Do not ignore this vulnerability.

Updated May 06, 2026 CVSS 9.8 · Critical

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Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: Critical Command Injection in TOTOLINK A8000RU. 📉 **Consequences**: Full device compromise.…

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Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: CWE-78 (OS Command Injection). 🐛 **Flaw**: The `setNtpCfg` function in `/cgi-bin/cstecgi.cgi` fails to sanitize the `tz` (timezone) parameter. Malicious input is passed directly to the OS shell.

Q3Who is affected? (Versions/Components)

🎯 **Affected Product**: TOTOLINK A8000RU Wireless Router. 📦 **Specific Version**: Firmware `7.1cu.643_b20200521`. ⚠️ **Component**: CGI Handler (`cstecgi.cgi`).

Q4What can hackers do? (Privileges/Data)

💀 **Attacker Capabilities**: Remote Code Execution (RCE). 👑 **Privileges**: Likely root/system level via CGI. 📂 **Data Impact**: Can read/write any file, install backdoors, or pivot to internal network.…

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Q5Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: LOW. 🌐 **Access**: Network Accessible (AV:N). 🔓 **Auth**: None Required (PR:N). 🖱️ **UI**: None Required (UI:N). 📊 **Complexity**: Low (AC:L). Easy to exploit remotely.

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

🔍 **Public Exploit**: Yes. 📂 **Source**: GitHub PoC available (`Litengzheng/vuldb_new2`). 📝 **Details**: VDB-359737 contains technical descriptions and indicators. Wild exploitation is highly probable given low barrier.

Q7How to self-check? (Features/Scanning)

🔎 **Self-Check**: Scan for `/cgi-bin/cstecgi.cgi`. 🧪 **Test**: Send crafted HTTP POST requests with malicious `tz` parameters to `setNtpCfg`.…

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Q8Is it fixed officially? (Patch/Mitigation)

🛠️ **Official Fix**: Check TOTOLINK website. 📅 **Date**: Published 2026-04-27. ⚠️ **Note**: Data does not confirm a specific patch release date yet, but vendor advisory exists. Update firmware immediately if available.

Q9What if no patch? (Workaround)

🚧 **Workaround**: Block external access to the router's management interface (Port 80/443). 🚫 **Filter**: Restrict CGI access to LAN only. 🛑 **Disable**: If possible, disable remote management features entirely.

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: CRITICAL. 🚨 **Priority**: P1. CVSS Score is High (9.8+ implied by vector). Immediate action required: Patch or isolate. Do not ignore this vulnerability.

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