CVE-2026-2823
📋 TL;DR
This CVE describes a command injection vulnerability in Comfast CF-E7 routers version 2.6.0.9. Attackers can remotely execute arbitrary commands by manipulating the 'timestr' parameter in the web management interface. This affects all users of the vulnerable router version who have the web interface exposed.
💻 Affected Systems
- Comfast CF-E7 Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent backdoor installation, network traffic interception, lateral movement to connected devices, and bricking of the device.
Likely Case
Remote code execution leading to router configuration changes, credential theft, DNS hijacking, and use as a pivot point for further attacks.
If Mitigated
Limited impact if web interface is not internet-facing and proper network segmentation is in place.
🎯 Exploit Status
Public exploit details are available in GitHub repositories. The vulnerability requires no authentication and has simple exploitation vectors.
🛠️ 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 devices or implementing strict network controls.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable the vulnerable web interface completely if not needed for management
Router-specific configuration command to disable web interface
Restrict Web Interface Access
linuxLimit access to the web interface to trusted IP addresses only
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Segment affected routers into isolated network zones with strict firewall rules
- Monitor all traffic to/from affected routers for unusual patterns or command injection attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or SSH. If version is 2.6.0.9, the device is vulnerable.Check Version:
curl -s http://router-ip/cgi-bin/version or check web interface admin panelVerify Fix Applied:
No official fix exists to verify. Workarounds can be verified by testing web interface accessibility and functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/mbox-config with timestr parameter containing shell metacharacters
- Failed authentication attempts followed by command injection patterns
Network Indicators:
- HTTP requests to router IP on port 80/443 containing shell commands in parameters
- Outbound connections from router to unusual external IPs
SIEM Query:
source="router_logs" AND uri="/cgi-bin/mbox-config" AND (param="timestr" AND value MATCHES "[;&|`$()]+")