CVE-2026-1623
📋 TL;DR
This CVE describes a remote command injection vulnerability in Totolink A7000R routers. Attackers can execute arbitrary commands by manipulating the FileName parameter in the firmware upgrade function. All users running the affected firmware version are vulnerable to remote compromise.
💻 Affected Systems
- Totolink A7000R
⚠️ 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
Full device takeover allowing installation of persistent malware, credential theft, network pivoting, and participation in botnets.
Likely Case
Remote code execution leading to device compromise, network surveillance, and potential lateral movement within the network.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public proof-of-concept exploit available on GitHub with detailed exploitation steps.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Totolink website for firmware updates
2. Download latest firmware
3. Access router admin panel
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable WAN Management
allPrevent external access to router management interface
Access router admin panel > Security > Remote Management > Disable
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Place router behind firewall with strict inbound rules blocking all WAN access to management ports
- Implement network monitoring for unusual outbound connections from the router
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin panel under System Status or About sectionCheck Version:
curl -k https://[router-ip]/cgi-bin/cstecgi.cgi -X POST -d '{"topicurl":"setting/getSysStatus"}'Verify Fix Applied:
Verify firmware version has been updated to a version newer than 4.1cu.4154📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with setUpgradeFW parameter
- Suspicious command execution in system logs
Network Indicators:
- Unexpected outbound connections from router
- Unusual traffic patterns from router management interface
SIEM Query:
source="router_logs" AND uri="/cgi-bin/cstecgi.cgi" AND (method="POST" AND data="setUpgradeFW")