CVE-2025-11100
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on D-Link DIR-823X routers by exploiting a command injection flaw in the uci_set function. Attackers can gain unauthorized access and potentially take full control of affected devices. Only D-Link DIR-823X routers running firmware version 250416 are affected.
💻 Affected Systems
- D-Link DIR-823X
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, intercept network traffic, pivot to internal networks, or use the device as part of a botnet.
Likely Case
Unauthorized access leading to network reconnaissance, credential theft, or device configuration changes that disrupt network services.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making this easily weaponizable. Attackers need network access to the device's management interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link support for latest firmware
Vendor Advisory: https://www.dlink.com/
Restart Required: Yes
Instructions:
1. Log into D-Link support portal. 2. Download latest firmware for DIR-823X. 3. Access router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and apply new firmware. 6. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the vulnerable web interface
Access router web interface > Advanced > Remote Management > Disable
Network Segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to block external access to ports 80/443 on router IP
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the router's management interface
- Monitor network traffic for unusual patterns and implement intrusion detection for command injection attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Tools > FirmwareCheck Version:
ssh admin@router_ip 'cat /etc/version' or check web interfaceVerify Fix Applied:
Confirm firmware version is newer than 250416 and test if exploit payloads no longer work📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/set_wifi_blacklists
- Commands with shell metacharacters in web logs
- Failed authentication attempts followed by successful exploitation
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting command execution
- Unexpected services running on router
SIEM Query:
source="router_logs" AND (uri="/goform/set_wifi_blacklists" OR (method="POST" AND uri CONTAINS "goform"))