CVE-2026-2535
📋 TL;DR
This CVE describes a command injection vulnerability in Comfast CF-N1 V2 routers version 2.6.0.2. Attackers can remotely execute arbitrary commands by manipulating the 'channel' parameter in the mbox-config CGI endpoint. This affects all users of the vulnerable router version who have the web interface exposed.
💻 Affected Systems
- Comfast CF-N1 V2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attackers to install persistent backdoors, intercept network traffic, pivot to internal networks, or brick the device.
Likely Case
Router takeover leading to DNS hijacking, credential theft from connected devices, or participation in botnets.
If Mitigated
Limited impact if the router's web interface is not internet-facing and network segmentation prevents lateral movement.
🎯 Exploit Status
Public GitHub repository contains exploit details. No authentication required for exploitation.
🛠️ 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 replacing affected hardware.
🔧 Temporary Workarounds
Disable Web Interface
allDisable the router's web management interface if not needed
Router-specific - check admin interface for web management toggle
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected routers with different models from responsive vendors
- Implement strict firewall rules blocking external access to router management interfaces (ports 80/443)
🔍 How to Verify
Check if Vulnerable:
Check router web interface for version 2.6.0.2. Test with curl: curl -X POST 'http://router-ip/cgi-bin/mbox-config?method=SET§ion=ptest_channel&channel=test;id'Check Version:
Login to router web interface and check firmware version in system statusVerify Fix Applied:
No fix available to verify. If router replaced, verify new model and firmware version.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/mbox-config with shell metacharacters in parameters
- Router logs showing command execution
Network Indicators:
- External IPs accessing router management interface
- Unusual outbound connections from router
SIEM Query:
source="router.log" AND (uri="/cgi-bin/mbox-config" AND (param="channel" AND value MATCHES "[;|&$()]"))