CVE-2025-67187
📋 TL;DR
A stack-based buffer overflow vulnerability in TOTOLINK A950RG routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the setIpQosRules interface. This affects all users running the vulnerable firmware version, potentially giving attackers full control of affected devices.
💻 Affected Systems
- TOTOLINK A950RG
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept network traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public GitHub repository contains detailed analysis and likely exploit code. Buffer overflow with no authentication required makes exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check TOTOLINK official website for firmware updates. 2. Download latest firmware for A950RG. 3. Access router web 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 management interface
Access router web interface > Advanced Settings > Remote Management > Disable
Network Segmentation
allIsolate router management interface to trusted network segment
Configure firewall rules to restrict access to router IP on ports 80/443 to trusted IPs only
🧯 If You Can't Patch
- Replace vulnerable devices with supported models from different vendors
- Implement strict network segmentation and firewall rules to isolate routers from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or About sectionCheck Version:
curl -s http://router-ip/cgi-bin/getStatus.cgi | grep firmwareVerify Fix Applied:
Verify firmware version is newer than V4.1.2cu.5204_B20210112📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/setIpQosRules.cgi
- Multiple failed buffer overflow attempts
- Unexpected process crashes in firewall module
Network Indicators:
- Unusual traffic patterns from router to external IPs
- Exploit-specific payloads in HTTP requests to router
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/setIpQosRules.cgi" OR process="firewall.so")