CVE-2026-5852 — AI Deep Analysis Summary

🚨 **Essence**: OS Command Injection in TOTOLINK A7100RU. <br>🔥 **Consequences**: Attackers can inject malicious OS commands via the `setIptvCfg` function.…

🛡️ **Root Cause**: **CWE-78** (OS Command Injection). <br>🔍 **Flaw**: The `cgi-bin/cstecgi.cgi` file's `setIptvCfg` function fails to properly sanitize the `igmpVer` parameter.…

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

💀 **Privileges**: **Root/Admin Level**. <br>📊 **Impact**: **High (H/H/H)**. Attackers can execute arbitrary commands, steal sensitive config data, modify system integrity, and cause complete service denial.

🔓 **Threshold**: **LOW**. <br>🌐 **Access**: Network Accessible (AV:N). <br>🔑 **Auth**: **No Privileges Required** (PR:N). <br>👀 **UI**: **No User Interaction** (UI:N). Remote exploitation is trivial.

💻 **Public Exploit**: **Yes**. <br>🔗 **Source**: GitHub repository `Litengzheng/vuldb_new` contains PoC/Exploit code. <br>📢 **Status**: Active exploitation potential is high due to available tools.

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

🛠️ **Official Fix**: **Unknown/Not Explicitly Stated**. <br>📝 **Note**: The data does not confirm a patched version exists. Check vendor site [totolink.net](https://www.totolink.net/) for updates.…

🚧 **Workaround**: **Block External Access**. <br>🔒 **Action**: Disable remote management (WAN access) to the router's web interface.…

🚨 **Urgency**: **CRITICAL (P1)**. <br>📉 **CVSS**: **9.8** (Critical). <br>⏳ **Priority**: Immediate action required. High severity + No Auth + Public Exploit = **High Risk**. Patch or isolate immediately.