CVE-2025-11099
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on D-Link DIR-823X routers through command injection in the uci_del function. Attackers can exploit this to gain unauthorized access and 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
Full system compromise allowing attacker to install persistent backdoors, intercept network traffic, pivot to internal networks, or brick the device.
Likely Case
Unauthorized access to router configuration, network traffic monitoring, DNS hijacking, or launching attacks against internal devices.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted.
🎯 Exploit Status
Public exploit details available on GitHub. Attack requires network access to the router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
Check D-Link website for firmware updates. If available, download and install through web interface: Login > Maintenance > Firmware Update > Browse > Upload > Apply.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the vulnerable web interface
Login to router > Advanced > Remote Management > Disable
Network segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace affected device with supported model
- Implement strict firewall rules blocking all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in web interface: Login > Status > Device Info > Firmware Version. If version is 250416, device is vulnerable.Check Version:
curl -s http://router-ip/status_deviceinfo.htm | grep 'Firmware Version'Verify Fix Applied:
After firmware update, verify version is newer than 250416 and test if /goform/delete_prohibiting endpoint still accepts malicious input.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/delete_prohibiting
- Commands with shell metacharacters in delvalue parameter
- Multiple failed login attempts followed by successful exploitation
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs originating from router
- DNS queries to suspicious domains
SIEM Query:
source="router-logs" AND (uri="/goform/delete_prohibiting" OR (method="POST" AND uri CONTAINS "delete_prohibiting"))