CVE-2026-3798
📋 TL;DR
This CVE describes a command injection vulnerability in Comfast CF-AC100 routers version 2.6.0.8. Attackers can execute arbitrary commands remotely by manipulating the ping configuration endpoint. Organizations using affected Comfast routers are vulnerable to compromise.
💻 Affected Systems
- Comfast CF-AC100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to network compromise, data exfiltration, or use as a pivot point for internal attacks.
Likely Case
Unauthorized command execution allowing configuration changes, network disruption, or installation of malware.
If Mitigated
Limited impact if network segmentation isolates the device and strict access controls are in place.
🎯 Exploit Status
Public exploit code exists on GitHub, making exploitation straightforward for attackers.
🛠️ 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.
🔧 Temporary Workarounds
Disable web management interface
linuxDisable the vulnerable CGI endpoint by turning off web management if not required.
Access router CLI via SSH/Telnet and disable web interface: 'no service web' or similar command
Network segmentation
allIsolate affected routers in separate VLANs with strict firewall rules.
🧯 If You Can't Patch
- Implement strict network access controls to limit access to router management interface
- Monitor network traffic to/from affected devices for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check router web interface version at 192.168.1.1 or similar default IP, or use SSH/Telnet to check firmware version.Check Version:
ssh admin@router-ip 'cat /etc/version' or check web interface About pageVerify Fix Applied:
Test if the vulnerable endpoint (/cgi-bin/mbox-config?method=SET§ion=ping_config) responds to command injection attempts.📡 Detection & Monitoring
Log Indicators:
- Unusual commands in system logs
- Multiple failed authentication attempts to web interface
- Suspicious CGI requests
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs
- Unexpected port scans originating from router
SIEM Query:
source="router-logs" AND (uri="/cgi-bin/mbox-config" OR command="ping_config")