CVE-2026-2824
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Comfast CF-E7 routers via command injection in the web management interface. Attackers can exploit this flaw without authentication by manipulating the 'destination' parameter in a specific CGI endpoint. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Comfast CF-E7
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to establish persistent access, intercept network traffic, pivot to internal networks, or use the device as part of a botnet.
Likely Case
Attackers gain shell access to the router, enabling them to modify configurations, steal credentials, or launch attacks against internal devices.
If Mitigated
If the router is behind a firewall with strict inbound rules and web management is disabled on WAN interfaces, the attack surface is significantly reduced.
🎯 Exploit Status
The exploit has been published on GitHub and appears to be straightforward to execute. No authentication is required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch is available. The vendor did not respond to disclosure attempts. Consider replacing the device or implementing workarounds.
🔧 Temporary Workarounds
Disable Web Management on WAN Interface
allPrevent external access to the vulnerable web interface by disabling web management on the WAN/Internet-facing interface.
Restrict Web Interface Access
allConfigure firewall rules to only allow trusted IP addresses to access the router's web management interface.
🧯 If You Can't Patch
- Isolate the router in a separate VLAN with strict network segmentation to limit potential lateral movement
- Implement network monitoring and intrusion detection specifically for command injection attempts targeting the /cgi-bin/mbox-config endpoint
🔍 How to Verify
Check if Vulnerable:
Check if the router responds to requests at /cgi-bin/mbox-config?method=SET§ion=ping_config with a destination parameter. If the firmware version is 2.6.0.9, assume vulnerability.Check Version:
Check the router's web interface administration page or use command line: telnet/router CLI commands may show version informationVerify Fix Applied:
Test the vulnerable endpoint with command injection payloads to confirm they no longer execute. Since no patch exists, verification involves confirming workarounds are properly implemented.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/mbox-config with shell metacharacters in parameters
- Unexpected command execution in system logs
- Failed authentication attempts followed by exploitation attempts
Network Indicators:
- HTTP requests containing shell commands (semicolons, pipes, backticks) in the destination parameter
- Unusual outbound connections from the router to external IPs
SIEM Query:
http.url:"/cgi-bin/mbox-config*" AND http.param:"destination=*;*" OR http.param:"destination=*|*" OR http.param:"destination=*`*"