CVE-2026-5978 — 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. 💥 **Impact**: Full device compromise, data theft, and network disruption.

Q: Root Cause? (CWE/Flaw)

🛡️ **CWE**: CWE-78 (OS Command Injection). 🔍 **Flaw**: Improper input validation in `/cgi-bin/cstecgi.cgi`. ⚠️ **Specifics**: The `setWiFiAclRules` function mishandles the `mode` parameter.

Q: Who is affected? (Versions/Components)

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

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

👑 **Privileges**: High (CVSS 9.8). 📂 **Data**: Full Confidentiality, Integrity, and Availability loss. 🌐 **Access**: Remote code execution without authentication.

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

🚪 **Auth**: None required (PR:N). 🌍 **Network**: Remote (AV:N). ⚡ **Complexity**: Low (AC:L). 👤 **User Interaction**: None (UI:N). ✅ **Threshold**: Extremely Low.

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

💻 **Exploit**: Yes, public PoC exists. 🔗 **Source**: GitHub repository (Litengzheng/vuldb_new). 🔥 **Status**: Wild exploitation is feasible.

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

🔎 **Check**: Scan for `/cgi-bin/cstecgi.cgi`. 📡 **Target**: Look for `setWiFiAclRules` endpoint. 🧪 **Test**: Inject payloads into `mode` parameter.

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

🛠️ **Fix**: Vendor advisory exists. 📥 **Action**: Update firmware to patched version. 🔗 **Ref**: Check TOTOLINK official site or VDB entry.

Q: What if no patch? (Workaround)

🚧 **Workaround**: Block external access to CGI interface. 🔒 **Network**: Restrict management port to LAN only. 🚫 **Filter**: Disable unnecessary remote management features.

Q: Is it urgent? (Priority Suggestion)

🔴 **Priority**: CRITICAL. ⏱️ **Urgency**: Immediate action required. 📉 **Risk**: High CVSS score (9.8) + No Auth needed. 🚀 **Recommendation**: Patch or isolate immediately.

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. <br>💥 **Impact**: Full device compromise, data theft, and network disruption.

Q2Root Cause? (CWE/Flaw)

🛡️ **CWE**: CWE-78 (OS Command Injection). <br>🔍 **Flaw**: Improper input validation in `/cgi-bin/cstecgi.cgi`. <br>⚠️ **Specifics**: The `setWiFiAclRules` function mishandles the `mode` parameter.

Q3Who is affected? (Versions/Components)

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

Q4What can hackers do? (Privileges/Data)

👑 **Privileges**: High (CVSS 9.8). <br>📂 **Data**: Full Confidentiality, Integrity, and Availability loss. <br>🌐 **Access**: Remote code execution without authentication.

Q5Is exploitation threshold high? (Auth/Config)

🚪 **Auth**: None required (PR:N). <br>🌍 **Network**: Remote (AV:N). <br>⚡ **Complexity**: Low (AC:L). <br>👤 **User Interaction**: None (UI:N). <br>✅ **Threshold**: Extremely Low.

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

💻 **Exploit**: Yes, public PoC exists. <br>🔗 **Source**: GitHub repository (Litengzheng/vuldb_new). <br>🔥 **Status**: Wild exploitation is feasible.

Q7How to self-check? (Features/Scanning)

🔎 **Check**: Scan for `/cgi-bin/cstecgi.cgi`. <br>📡 **Target**: Look for `setWiFiAclRules` endpoint. <br>🧪 **Test**: Inject payloads into `mode` parameter.

Q8Is it fixed officially? (Patch/Mitigation)

🛠️ **Fix**: Vendor advisory exists. <br>📥 **Action**: Update firmware to patched version. <br>🔗 **Ref**: Check TOTOLINK official site or VDB entry.

Q9What if no patch? (Workaround)

🚧 **Workaround**: Block external access to CGI interface. <br>🔒 **Network**: Restrict management port to LAN only. <br>🚫 **Filter**: Disable unnecessary remote management features.

Q10Is it urgent? (Priority Suggestion)

🔴 **Priority**: CRITICAL. <br>⏱️ **Urgency**: Immediate action required. <br>📉 **Risk**: High CVSS score (9.8) + No Auth needed. <br>🚀 **Recommendation**: Patch or isolate immediately.

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