CVE-2025-7460
📋 TL;DR
This critical vulnerability in TOTOLINK T6 routers allows remote attackers to execute arbitrary code via a buffer overflow in the WiFi ACL rules configuration function. Attackers can exploit this by sending specially crafted HTTP POST requests to the vulnerable CGI endpoint. All users running the affected firmware version are at risk.
💻 Affected Systems
- TOTOLINK T6
📦 What is this software?
T6 Firmware by Totolink
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and potential lateral movement to connected systems.
Likely Case
Remote code execution allowing attackers to install malware, create backdoors, intercept network traffic, or use the device as part of a botnet.
If Mitigated
Denial of service or limited information disclosure if exploit attempts are blocked by network controls.
🎯 Exploit Status
Public proof-of-concept exploit code is available, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check TOTOLINK official website for firmware updates. 2. Download latest firmware for T6 model. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to the vulnerable web interface
Access router admin interface -> System -> Remote Management -> Disable
Block CGI endpoint access
linuxUse firewall rules to block access to the vulnerable endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/cgi-bin/cstecgi.cgi" --algo bm -j DROP
🧯 If You Can't Patch
- Isolate affected routers in separate network segments with strict firewall rules
- Implement network-based intrusion prevention systems to detect and block exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System -> Firmware UpgradeCheck Version:
curl -s http://router-ip/cgi-bin/cstecgi.cgi | grep -i versionVerify Fix Applied:
Verify firmware version is no longer 4.1.5cu.748_B20211015📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /cgi-bin/cstecgi.cgi with setWiFiAclRules function
- Unusual buffer overflow error messages in router logs
Network Indicators:
- HTTP traffic containing 'mac' parameter with unusually long values
- Multiple failed exploit attempts from single source
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/cstecgi.cgi" AND method="POST" AND params CONTAINS "setWiFiAclRules")