CVE-2026-1125
📋 TL;DR
This CVE describes a remote command injection vulnerability in D-Link DIR-823X routers. Attackers can execute arbitrary commands by manipulating the wd_enable parameter in the set_wifidog_settings function. All users of affected D-Link DIR-823X routers with firmware version 250416 are vulnerable.
💻 Affected Systems
- D-Link DIR-823X
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install malware, pivot to internal networks, create persistent backdoors, or use the device in botnets.
Likely Case
Attackers gain shell access to execute commands, potentially installing cryptocurrency miners, conducting DDoS attacks, or stealing network credentials.
If Mitigated
Limited impact if device is behind strict firewall rules, but still vulnerable to internal attackers or if perimeter defenses are breached.
🎯 Exploit Status
Public exploit code is available on GitHub, making this easily weaponizable. The attack requires no authentication and has low technical complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available at time of analysis
Restart Required: Yes
Instructions:
1. Check D-Link's security advisories page for updates. 2. If a patch is released, download the firmware update. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the vulnerable web interface
Log into router admin → Advanced → Remote Management → Disable
Block Access to Vulnerable Endpoint
linuxUse firewall rules to block access to the vulnerable /goform/set_wifidog_settings endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "set_wifidog_settings" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "set_wifidog_settings" --algo bm -j DROP
🧯 If You Can't Patch
- Replace affected routers with different models that are not vulnerable
- Segment affected routers on isolated network segments with strict firewall rules
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 250416, the device is vulnerable.Check Version:
curl -s http://router-ip/ | grep -i firmware || Check web interface at http://router-ip/Verify Fix Applied:
After applying any firmware update, verify the version has changed from 250416 and test that the /goform/set_wifidog_settings endpoint no longer accepts malicious wd_enable parameters.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/set_wifidog_settings
- Commands like 'wget', 'curl', or 'sh' in URL parameters
- Multiple failed login attempts followed by exploitation attempts
Network Indicators:
- Unusual outbound connections from router to suspicious IPs
- Traffic patterns suggesting device is part of botnet
- Unexpected SSH or telnet connections originating from router
SIEM Query:
source="router-logs" AND (url="/goform/set_wifidog_settings" OR (url CONTAINS "set_wifidog_settings" AND (param CONTAINS "wget" OR param CONTAINS "curl" OR param CONTAINS "sh")))