CVE-2026-2210
📋 TL;DR
This CVE describes a remote command injection vulnerability in D-Link DIR-823X routers. Attackers can execute arbitrary operating system commands by manipulating the set_filtering function, potentially gaining full control of affected devices. All users of D-Link DIR-823X routers with 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, pivot to internal networks, intercept traffic, or use device as botnet node.
Likely Case
Remote code execution leading to device takeover, credential theft, and network surveillance.
If Mitigated
Limited impact if device is behind firewall with strict inbound rules and network segmentation.
🎯 Exploit Status
Public exploit code is available, making this easily weaponizable by attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check D-Link security advisories for patch availability. 2. Download latest firmware from official D-Link support site. 3. Upload firmware via web interface. 4. Reboot device after update.
🔧 Temporary Workarounds
Network Isolation
allPlace affected routers behind firewalls with strict inbound rules to block external exploitation.
Access Control
linuxRestrict administrative access to trusted IP addresses only.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace affected devices with patched or different models
- Implement strict network segmentation to isolate vulnerable devices
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under Maintenance > Firmware Update. If version is 250416, device is vulnerable.Check Version:
curl -s http://router-ip/status.asp | grep firmware_versionVerify Fix Applied:
Verify firmware version has changed from 250416 to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/set_filtering
- Suspicious command execution in system logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs
- Unexpected port scans originating from router
SIEM Query:
source="router.log" AND (uri="/goform/set_filtering" OR command="*sh*" OR command="*bash*")