CVE-2026-1741
📋 TL;DR
This CVE describes a backdoor vulnerability in the EFM ipTIME A8004T router's debug interface. Attackers can remotely manipulate the 'cmd' parameter to execute unauthorized commands. Only users of the specific router model and firmware version are affected.
💻 Affected Systems
- EFM ipTIME A8004T
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing remote code execution, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Unauthorized access to router configuration, network traffic interception, or denial of service.
If Mitigated
Limited impact if debug interface is disabled or network segmentation isolates the device.
🎯 Exploit Status
Exploit has been publicly disclosed but complexity is high. Remote attack possible without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor did not respond to disclosure. Consider workarounds or replacement.
🔧 Temporary Workarounds
Disable Debug Interface
allDisable the /sess-bin/d.cgi debug interface if possible through router administration.
Access router admin interface > Advanced Settings > Disable debug/development features
Network Segmentation
allIsolate the router from untrusted networks and restrict access to management interfaces.
Configure firewall rules to block external access to router management ports
🧯 If You Can't Patch
- Replace the router with a supported model from a responsive vendor
- Implement strict network access controls and monitor for suspicious activity targeting the router
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 14.18.2, device is vulnerable.Check Version:
Login to router admin interface and check System Status or Firmware InformationVerify Fix Applied:
No official fix available. Verify workarounds by testing if /sess-bin/d.cgi endpoint is inaccessible.📡 Detection & Monitoring
Log Indicators:
- Unusual access to /sess-bin/d.cgi
- Suspicious commands in router logs
- Failed authentication attempts to debug interface
Network Indicators:
- HTTP requests to /sess-bin/d.cgi with cmd parameter manipulation
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri="/sess-bin/d.cgi" OR cmd=*)