CVE-2025-6114
📋 TL;DR
A critical stack-based buffer overflow vulnerability in D-Link DIR-619L routers allows remote attackers to execute arbitrary code by manipulating specific arguments in the port forwarding form. This affects D-Link DIR-619L version 2.06B01, which is no longer supported by the vendor. Attackers can exploit this remotely without authentication to potentially take full control of affected devices.
💻 Affected Systems
- D-Link DIR-619L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, lateral movement to internal networks, and botnet recruitment.
Likely Case
Device takeover for use in DDoS botnets, credential theft from connected devices, or network traffic interception.
If Mitigated
Limited impact if device is isolated behind firewalls with strict ingress filtering, though device integrity remains compromised.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available as this product is end-of-life. Consider the workarounds and mitigation steps below.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface access from WAN/Internet to prevent remote exploitation
Access router admin panel > Advanced > Remote Management > Disable
Network Segmentation
linuxIsolate router management interface to dedicated VLAN or restrict access to trusted IPs 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 routers with supported models that receive security updates
- Implement strict network segmentation to isolate routers from critical assets
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel (typically 192.168.0.1 or 192.168.1.1) > Tools > System InfoCheck Version:
curl -s http://router-ip/tools_system.htm | grep -i 'firmware version'Verify Fix Applied:
Verify remote management is disabled and firewall rules block access to port 80/tcp from untrusted networks📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/form_portforwarding with long parameter values
- Unusual process creation or memory allocation errors in router logs
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- Traffic spikes indicating potential DDoS participation
SIEM Query:
source="router_logs" AND (url="/goform/form_portforwarding" AND (param_length>1000 OR status=500))