CVE-2025-6367
📋 TL;DR
This critical vulnerability in D-Link DIR-619L routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the web interface's domain filter functionality. Attackers can exploit this without authentication to potentially take full control of affected devices. Only products no longer supported by the vendor are affected.
💻 Affected Systems
- D-Link DIR-619L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and use as pivot point into internal networks
Likely Case
Device takeover for botnet recruitment, credential theft, or network traffic interception
If Mitigated
Limited impact if device is isolated behind firewalls with strict network segmentation
🎯 Exploit Status
Exploit code is publicly available on GitHub, making attacks easy to automate
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch available. Device is end-of-life. Replace with supported hardware.
🔧 Temporary Workarounds
Disable WAN access to web interface
allBlock external access to router administration interface
Configure firewall to block port 80/443 from WAN to router IP
Disable domain filter feature
allTurn off the vulnerable formSetDomainFilter functionality if possible
Navigate to router admin > Parental Controls > Domain Filter > Disable
🧯 If You Can't Patch
- Immediately replace affected routers with supported models
- Isolate vulnerable devices in separate VLAN with strict firewall rules
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface (Status > Firmware)Check Version:
curl -s http://router-ip/ | grep -i firmwareVerify Fix Applied:
Verify router has been replaced with supported model or isolated from network📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/formSetDomainFilter with long parameter values
- Unusual process execution or memory errors in system logs
Network Indicators:
- Exploit traffic patterns to vulnerable endpoint
- Unusual outbound connections from router
SIEM Query:
source="router-logs" AND uri="/goform/formSetDomainFilter" AND (param_length>100 OR status_code=500)