CVE-2026-1157
📋 TL;DR
A buffer overflow vulnerability in the Totolink LR350 router's WiFi configuration function allows remote attackers to execute arbitrary code. This affects users of Totolink LR350 routers with vulnerable firmware. Attackers can exploit this without authentication to potentially take full control of the device.
💻 Affected Systems
- Totolink LR350
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic interception, DNS manipulation, and use as a botnet node.
If Mitigated
Denial of service or limited information disclosure if exploit fails to achieve code execution.
🎯 Exploit Status
Public exploit details are available in the provided reference. The attack requires sending specially crafted requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.totolink.net/
Restart Required: Yes
Instructions:
1. Check Totolink website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface to trusted network segment only
🧯 If You Can't Patch
- Replace affected router with different model or vendor
- Implement strict firewall rules blocking access to port 80/443 on the router from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 9.3.5u.6369_B20220309, device is vulnerable.Check Version:
Login to router web interface and check System Status or Firmware Information page.Verify Fix Applied:
Verify firmware version has changed from vulnerable version after update.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with setWiFiEasyCfg function
- Large payloads in ssid parameter
- Multiple failed authentication attempts followed by exploitation attempts
Network Indicators:
- Unusual traffic patterns to router management interface
- Suspicious payloads in HTTP requests to router
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/cstecgi.cgi" AND params CONTAINS "setWiFiEasyCfg")