CVE-2025-4345
📋 TL;DR
A critical buffer overflow vulnerability in D-Link DIR-600L routers allows remote attackers to execute arbitrary code by manipulating the 'host' parameter in the formSetLog function. This affects all DIR-600L routers up to firmware version 2.07B01. These products are end-of-life and no longer receive security updates from the vendor.
💻 Affected Systems
- D-Link DIR-600L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and lateral movement into connected networks.
Likely Case
Remote code execution resulting in device takeover, credential theft, and use as pivot point for further attacks.
If Mitigated
Denial of service or limited information disclosure if exploit fails to achieve code execution.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository. Exploitation requires network access to web management interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch available. D-Link has ended support for DIR-600L. Replace with supported hardware.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface access from WAN/Internet
Access router admin panel > Advanced > Remote Management > Disable
Network Segmentation
allIsolate DIR-600L devices on separate VLAN with strict firewall rules
🧯 If You Can't Patch
- Immediately replace DIR-600L routers with supported, patched hardware
- Implement strict network access controls to limit exposure to management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin panel (typically 192.168.0.1) under Tools > System InfoCheck Version:
curl -s http://192.168.0.1/ | grep -i firmwareVerify Fix Applied:
Verify router has been replaced with supported hardware or is no longer in use📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formSetLog
- Multiple failed buffer overflow attempts
- Sudden configuration changes
Network Indicators:
- Unusual outbound connections from router
- Traffic to known exploit servers
- Port scanning originating from router
SIEM Query:
source="router.log" AND ("formSetLog" OR "host=" AND length>100)