CVE-2026-5977 — AI Deep Analysis Summary

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

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

Q: Root Cause? (CWE/Flaw)

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

Q: Who is affected? (Versions/Components)

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

Q: What can hackers do? (Privileges/Data)

💀 **Privileges**: Full System Access (Root/OS level). 🔓 **Data Impact**: High Confidentiality, Integrity, and Availability loss. Hackers gain complete control over the router.

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

⚡ **Threshold**: LOW. 🌐 **Auth**: None required (PR:N). 📡 **Access**: Network (AV:N). 🚫 **UI**: None required. Easy remote exploitation.

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

🔍 **Public Exploit**: Yes. 📂 **Source**: GitHub repository (Litengzheng/vuldb_new) contains PoC/Exploit details. 🚀 **Status**: Active exploitation potential is high.

Q: How to self-check? (Features/Scanning)

🔎 **Check**: Scan for `/cgi-bin/cstecgi.cgi` endpoint. 📡 **Test**: Send crafted HTTP requests with malicious `wifiOff` payloads. 🛠️ **Tools**: Use Nmap scripts or custom Python PoCs to verify injection.

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

🔄 **Patch**: Check Totolink official website for firmware updates. 📝 **Note**: Data indicates published date 2026-04-09; verify if vendor has released a fixed version since then.

Q: What if no patch? (Workaround)

🚧 **Workaround**: Block external access to `/cgi-bin/cstecgi.cgi` via firewall rules. 🛑 **Mitigation**: Disable remote management features if not needed. 📵 **Isolate**: Segment IoT devices from critical network segments.

Q: Is it urgent? (Priority Suggestion)

🔥 **Priority**: CRITICAL (CVSS 9.8). 🚨 **Action**: Immediate patching or network isolation required. ⏳ **Urgency**: High due to low exploitation barrier and high impact.

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**: Critical OS Command Injection in TOTOLINK A7100RU. 📉 **Consequences**: Attackers can execute arbitrary system commands, leading to total device compromise, data theft, and network takeover.

Q2Root Cause? (CWE/Flaw)

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

Q3Who is affected? (Versions/Components)

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

Q4What can hackers do? (Privileges/Data)

💀 **Privileges**: Full System Access (Root/OS level). 🔓 **Data Impact**: High Confidentiality, Integrity, and Availability loss. Hackers gain complete control over the router.

Q5Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: LOW. 🌐 **Auth**: None required (PR:N). 📡 **Access**: Network (AV:N). 🚫 **UI**: None required. Easy remote exploitation.

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

🔍 **Public Exploit**: Yes. 📂 **Source**: GitHub repository (Litengzheng/vuldb_new) contains PoC/Exploit details. 🚀 **Status**: Active exploitation potential is high.

Q7How to self-check? (Features/Scanning)

🔎 **Check**: Scan for `/cgi-bin/cstecgi.cgi` endpoint. 📡 **Test**: Send crafted HTTP requests with malicious `wifiOff` payloads. 🛠️ **Tools**: Use Nmap scripts or custom Python PoCs to verify injection.

Q8Is it fixed officially? (Patch/Mitigation)

🔄 **Patch**: Check Totolink official website for firmware updates. 📝 **Note**: Data indicates published date 2026-04-09; verify if vendor has released a fixed version since then.

Q9What if no patch? (Workaround)

🚧 **Workaround**: Block external access to `/cgi-bin/cstecgi.cgi` via firewall rules. 🛑 **Mitigation**: Disable remote management features if not needed. 📵 **Isolate**: Segment IoT devices from critical network segments.

Q10Is it urgent? (Priority Suggestion)

🔥 **Priority**: CRITICAL (CVSS 9.8). 🚨 **Action**: Immediate patching or network isolation required. ⏳ **Urgency**: High due to low exploitation barrier and high impact.

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