CVE-2025-60558
📋 TL;DR
This buffer overflow vulnerability in D-Link DIR600L routers allows attackers to execute arbitrary code by sending specially crafted requests to the formVirtualServ function. Attackers can potentially take full control of affected routers. All users running vulnerable firmware versions are affected.
💻 Affected Systems
- D-Link DIR600L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete router compromise, credential theft, network traffic interception, and lateral movement into internal networks.
Likely Case
Router compromise leading to DNS hijacking, credential harvesting, or botnet recruitment for DDoS attacks.
If Mitigated
Denial of service or router instability if exploit fails or is partially successful.
🎯 Exploit Status
Public proof-of-concept available on GitHub. Exploitation requires crafting specific HTTP requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check D-Link support site for firmware updates. 2. Download latest firmware for DIR600L. 3. Access router web interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface to trusted network
🧯 If You Can't Patch
- Replace affected router with supported model
- Implement strict firewall rules blocking access to router management interface from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System > Firmware or by accessing http://router_ip/status.aspCheck Version:
curl -s http://router_ip/status.asp | grep -i firmwareVerify Fix Applied:
Verify firmware version is newer than FW116WWb01 and test formVirtualServ endpoint with safe payloads📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to formVirtualServ endpoint
- Multiple failed login attempts followed by formVirtualServ access
- Router reboot events after suspicious requests
Network Indicators:
- HTTP traffic to router IP on port 80/443 with unusually long curTime parameters
- Outbound connections from router to suspicious IPs
SIEM Query:
source="router_logs" AND (uri="*formVirtualServ*" OR method="POST" AND uri="*virtual*serv*" AND param_length>100)