CVE-2025-11098
📋 TL;DR
This CVE describes a command injection vulnerability in D-Link DIR-823X routers that allows remote attackers to execute arbitrary commands on affected devices. The vulnerability exists in the /goform/set_wifi_blacklists endpoint where the macList parameter is not properly sanitized. All users of affected D-Link DIR-823X routers with firmware version 250416 are vulnerable to this attack.
💻 Affected Systems
- D-Link DIR-823X
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent backdoors, intercept network traffic, pivot to internal networks, or brick the device.
Likely Case
Attacker gains shell access to router, modifies network settings, intercepts traffic, or uses device as part of botnet.
If Mitigated
Attack fails due to proper input validation or network segmentation preventing access to vulnerable endpoint.
🎯 Exploit Status
Exploit details are publicly available on GitHub. Attack requires access to the management interface but may not require authentication depending on device configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link website for latest firmware
Vendor Advisory: https://www.dlink.com/
Restart Required: Yes
Instructions:
1. Visit D-Link support website 2. Download latest firmware for DIR-823X 3. Log into router admin panel 4. Navigate to firmware update section 5. Upload and apply new firmware 6. Reboot router
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Network Segmentation
allPlace router on isolated management network
🧯 If You Can't Patch
- Block access to /goform/set_wifi_blacklists endpoint at network perimeter
- Implement strict firewall rules limiting management interface access to trusted IPs only
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel. If version is 250416, device is vulnerable.Check Version:
Check via web interface: Login to router admin panel and navigate to System Status or Firmware InformationVerify Fix Applied:
After firmware update, verify version has changed from 250416 to newer version.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/set_wifi_blacklists
- Commands with shell metacharacters in macList parameter
- Multiple failed authentication attempts followed by successful exploit
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting command and control communication
- Port scans originating from router
SIEM Query:
source="router_logs" AND (uri="/goform/set_wifi_blacklists" OR (macList CONTAINS "|" OR macList CONTAINS ";" OR macList CONTAINS "`"))