CVE-2025-6369
📋 TL;DR
A critical stack-based buffer overflow vulnerability in D-Link DIR-619L routers allows remote attackers to execute arbitrary code by manipulating the curTime/config.save_network_enabled parameter. This affects users of D-Link DIR-619L firmware version 2.06B01, particularly those with devices exposed to the internet. The vulnerability is especially dangerous because these products are no longer supported by the manufacturer.
💻 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, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept network traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Exploit code is publicly available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch available. D-Link has ended support for this product. Consider replacement as primary remediation.
🔧 Temporary Workarounds
Disable Remote Management
allDisable remote administration/management features to prevent external exploitation
Access router web interface > Advanced > Remote Management > Disable
Restrict Management Interface Access
linuxConfigure firewall rules to restrict access to router management interface (port 80/443)
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Replace affected D-Link DIR-619L routers with supported models from any vendor
- Isolate vulnerable routers in separate network segments with strict firewall rules
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: Login > Tools > System > Firmware InformationCheck Version:
curl -s http://router-ip/ | grep -i 'firmware' or check web interfaceVerify Fix Applied:
Verify router has been replaced or isolated. No patch verification possible.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formdumpeasysetup
- Multiple failed buffer overflow attempts in system logs
- Unexpected process execution or configuration changes
Network Indicators:
- Unusual traffic patterns to router management interface from external IPs
- POST requests with abnormally long curTime/config.save_network_enabled parameters
SIEM Query:
source="router_logs" AND (url="/goform/formdumpeasysetup" OR "formdumpeasysetup") AND (bytes_sent>1000 OR status_code=500)