CVE-2025-67189
📋 TL;DR
A buffer overflow vulnerability in TOTOLINK A950RG routers allows remote attackers to cause denial of service or potentially execute arbitrary code by exploiting improper input validation in the setParentalRules interface. This affects users of TOTOLINK A950RG routers with vulnerable firmware versions. Attackers can exploit this without authentication to compromise 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 unauthenticated attacker achieves arbitrary code execution with root privileges, leading to complete device compromise, persistence, and network infiltration.
Likely Case
Remote attacker causes denial of service by crashing the router service or device, disrupting network connectivity for all users.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated network segments with no critical systems exposed.
🎯 Exploit Status
Public proof-of-concept exists on GitHub. The vulnerability requires no authentication and has straightforward exploitation due to lack of input validation.
🛠️ 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 after update.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Network Segmentation
allIsolate router management interface to trusted network segment only
🧯 If You Can't Patch
- Implement strict firewall rules to block all external access to router management interface (typically ports 80/443)
- Disable parental control features if not required to remove vulnerable functionality
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: Login > System > Firmware Upgrade. If version is V4.1.2cu.5204_B20210112, device is vulnerable.Check Version:
curl -s http://router-ip/version or check web interface at System > Firmware UpgradeVerify Fix Applied:
After firmware update, verify version has changed from vulnerable version. Test parental control functionality to ensure it works without crashing.📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to setParentalRules endpoint
- Router service crashes or restarts
- Unusual POST requests with long urlKeyword parameters
Network Indicators:
- HTTP POST requests to /cgi-bin/setParentalRules with oversized payloads
- Traffic to router management interface from unexpected sources
SIEM Query:
source="router-logs" AND (uri_path="/cgi-bin/setParentalRules" AND content_length>1000)