CVE-2026-2193
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on D-Link DI-7100G routers by injecting malicious input into the usb_username parameter of the set_jhttpd_info function. Affected systems are D-Link DI-7100G C1 routers running firmware version 24.04.18D1, potentially enabling complete device compromise.
💻 Affected Systems
- D-Link DI-7100G C1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise allowing attacker to intercept all network traffic, install persistent backdoors, pivot to internal networks, and brick the device.
Likely Case
Router takeover enabling traffic interception, credential theft, and use as attack platform against internal systems.
If Mitigated
Limited impact if device is isolated, has restricted USB access, and network segmentation prevents lateral movement.
🎯 Exploit Status
Public GitHub repository contains vulnerability details and likely exploitation methods. Command injection via usb_username parameter is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.dlink.com/
Restart Required: Yes
Instructions:
1. Check D-Link website for firmware updates. 2. Download latest firmware for DI-7100G C1. 3. Access router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable USB Services
allTurn off USB functionality to remove attack vector
Access router admin interface
Navigate to USB settings
Disable all USB services
Network Segmentation
allIsolate router from critical networks
Configure firewall rules to restrict router access
Place router in DMZ or isolated VLAN
🧯 If You Can't Patch
- Disable WAN access to router admin interface
- Implement strict network segmentation and monitor for suspicious USB-related activity
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status or Firmware Update sectionCheck Version:
Login to router web interface and check System Information pageVerify Fix Applied:
Verify firmware version is updated beyond 24.04.18D1 and test USB functionality with controlled inputs📡 Detection & Monitoring
Log Indicators:
- Unusual USB configuration changes
- Suspicious commands in system logs
- Multiple failed authentication attempts to admin interface
Network Indicators:
- Unexpected outbound connections from router
- Traffic patterns suggesting command and control
- Port scans originating from router
SIEM Query:
source="router_logs" AND ("usb_username" OR "set_jhttpd_info") AND command="*"