Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

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

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛡️ **Root Cause**: CWE-78 (OS Command Injection).
🔍 **Flaw**: Improper handling of the `pppoeServiceName` parameter in the `setWanCfg` function within `/cgi-bin/cstecgi.cgi`.…

Question 3

Who is affected? (Versions/Components)

Accepted Answer

📦 **Affected Product**: TOTOLINK A7100RU Wireless Router.
📅 **Specific Version**: Firmware version **7.4cu.2313**.
🏢 **Vendor**: TOTOLINK (China Jicong Electronics).

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

👑 **Privileges**: Likely Root/System level access due to CGI handler execution context.
📂 **Data**: Full read/write access to the router's file system.
🌐 **Network**: Can pivot attacks to internal LAN.…

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

📉 **Threshold**: **LOW**.
🔓 **Auth**: No authentication required (`PR:N`).
🌍 **Access**: Network accessible (`AV:N`).
🎯 **Complexity**: Low (`AC:L`).
👤 **UI**: No user interaction needed (`UI:N`).…

Question 6

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

Accepted Answer

📂 **Public Exploit**: Yes.
🔗 **Source**: GitHub repository `Litengzheng/vuldb_new` contains a PoC/Exploit for this specific vulnerability.
⚠️ **Status**: Active exploitation is possible using provided scripts.

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Self-Check**: Scan for the specific CGI endpoint: `/cgi-bin/cstecgi.cgi`.
🧪 **Test**: Attempt to inject commands via the `setWanCfg` parameter, specifically targeting `pppoeServiceName`.…

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

🛠️ **Official Fix**: The data indicates a published CVE (2026-04-13) and vendor advisory links.
✅ **Action**: Check TOTOLINK official website for firmware updates newer than 7.4cu.2313.…

Question 9

What if no patch? (Workaround)

Accepted Answer

🚧 **Workaround**:
1. **Disable WAN**: If possible, restrict internet access.
2. **Firewall**: Block external access to port 80/443 (HTTP/HTTPS) on the router.
3.…

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🔥 **Urgency**: **CRITICAL**.
📊 **CVSS**: 9.8 (Critical).
⏳ **Priority**: Immediate action required.
🚀 **Recommendation**: Patch immediately or isolate the device.…

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CVE-2026-6155 — AI Deep Analysis Summary

Q1What is this vulnerability? (Essence + Consequences)

Q2Root Cause? (CWE/Flaw)

Q3Who is affected? (Versions/Components)

Q4What can hackers do? (Privileges/Data)

Q5Is exploitation threshold high? (Auth/Config)

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

Q7How to self-check? (Features/Scanning)

Q8Is it fixed officially? (Patch/Mitigation)

Q9What if no patch? (Workaround)

Q10Is it urgent? (Priority Suggestion)

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