CVE-2025-8169
📋 TL;DR
A critical buffer overflow vulnerability in D-Link DIR-513 routers allows remote attackers to execute arbitrary code by sending specially crafted HTTP POST requests. This affects the formSetWanPPTPcallback function and can be exploited without authentication. Only unsupported legacy devices running version 1.10 are vulnerable.
💻 Affected Systems
- D-Link DIR-513
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic interception, credential theft, and use as attack platform against internal networks.
If Mitigated
Limited impact if device is isolated behind firewalls with strict inbound filtering, though lateral movement risk remains.
🎯 Exploit Status
Public exploit details available. Attack requires sending crafted HTTP POST to /goform/formSetWanPPTPpath with manipulated curTime parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch exists as product is end-of-life. Replace with supported hardware.
🔧 Temporary Workarounds
Network Isolation
allPlace router behind firewall with strict inbound filtering to block external access to web interface.
Disable Remote Management
allTurn off remote administration features if enabled in router settings.
🧯 If You Can't Patch
- Immediately replace affected routers with supported models
- Segment network to isolate vulnerable devices and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or using nmap scan for device identification.Check Version:
curl -s http://192.168.0.1/ | grep -i 'firmware' or check web interface System Status pageVerify Fix Applied:
Verify replacement with supported hardware or successful network isolation measures.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formSetWanPPTPpath
- Multiple failed buffer overflow attempts in system logs
Network Indicators:
- HTTP traffic to router on port 80 with large curTime parameters
- Unusual outbound connections from router
SIEM Query:
source_ip=router_ip AND (url_path="/goform/formSetWanPPTPpath" OR method="POST")