CVE-2026-4181 — AI Deep Analysis Summary

🚨 **Essence**: CVE-2026-4181 is a **Stack-based Buffer Overflow** in D-Link DIR-816.…

🛡️ **Root Cause**: **CWE-121** (Stack-based Buffer Overflow). <br>🔍 **Flaw**: Improper handling of parameters (`key1`-`key4`, `pskValue`) in the CGI script `/goform/form2RepeaterStep2.cgi`.…

📦 **Affected Product**: D-Link DIR-816 Wireless Router. <br>📌 **Specific Version**: **1.10CNB05**. <br>⚠️ **Vendor**: D-Link (China). Check your firmware version immediately!

👑 **Privileges**: **Root/System Level**. <br>📂 **Data Access**: Full read/write access to the router. <br>🌐 **Impact**: Can pivot attacks to the entire local network, intercept traffic, or install malware.…

⚡ **Exploitation Threshold**: **LOW**. <br>🔓 **Auth Required**: **None** (PR:N). <br>🌍 **Access Vector**: Network (AV:N). <br>🎯 **Complexity**: Low (AC:L). Any unauthenticated user on the network can exploit this.

📢 **Public Exploit**: **Yes**. <br>🔗 **Evidence**: References include GitHub PoCs (`wudipjq/my_vuln`) and VDB entries (VDB-351085). <br>⚠️ **Status**: Active exploitation indicators exist.…

🔍 **Self-Check Method**: <br>1. Scan for open ports on D-Link DIR-816. <br>2. Target the endpoint: `/goform/form2RepeaterStep2.cgi`. <br>3. Send malformed payloads in `key1`-`key4` or `pskValue` parameters. <br>4.…

🩹 **Official Patch**: **Unknown/Not Listed**. <br>📝 **Note**: The provided data does not confirm a released patch. <br>🔗 **Reference**: Check D-Link's official support page for DIR-816 updates.…

🛡️ **Workaround (No Patch)**: <br>1. **Isolate**: Move the router to a separate VLAN or disable remote management. <br>2. **Filter**: Block external access to port 80/443 if possible. <br>3.…

🔥 **Urgency**: **CRITICAL**. <br>🚨 **Priority**: **Immediate Action Required**. <br>📉 **Risk**: High CVSS (9.8) + No Auth + Public PoC = **High Likelihood of Attack**. Patch or isolate immediately.