CVE-2025-6373
📋 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 parameter. This affects D-Link DIR-619L firmware version 2.06B01. The vulnerability is particularly dangerous because these products are no longer supported by the vendor.
💻 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 lateral movement to connected networks.
Likely Case
Remote code execution allowing attackers to take control of the router, intercept network traffic, and pivot to internal systems.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal threats remain possible.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch exists as this product is end-of-life. Replace with supported hardware.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected routers in separate VLANs with strict firewall rules to limit attack surface.
Access Control Lists
allImplement network ACLs to restrict access to the vulnerable web interface port (typically TCP 80/443).
🧯 If You Can't Patch
- Immediately replace affected D-Link DIR-619L routers with supported hardware from any vendor.
- If replacement is delayed, isolate the router from critical networks and disable remote administration features.
🔍 How to Verify
Check if Vulnerable:
Check router web interface for firmware version 2.06B01 or examine device label for model DIR-619L.Check Version:
Access router web interface at http://[router-ip] and check firmware version in status/system pages.Verify Fix Applied:
Verify device has been physically replaced with supported hardware or removed from network.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formWlSiteSurvey with manipulated curTime parameter
- Multiple failed exploitation attempts
Network Indicators:
- Unusual outbound connections from router IP
- Traffic patterns suggesting router compromise
SIEM Query:
source_ip="router_ip" AND (url_path="/goform/formWlSiteSurvey" OR method="POST")