CVE-2025-5622
📋 TL;DR
This critical vulnerability in D-Link DIR-816 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the wireless configuration function. Attackers can exploit this without authentication to potentially take complete control of affected devices. Only unsupported D-Link DIR-816 routers running specific firmware versions are affected.
💻 Affected Systems
- D-Link DIR-816
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, network pivoting, and data exfiltration.
Likely Case
Device takeover enabling attackers to intercept network traffic, modify router settings, or use the device as part of a botnet.
If Mitigated
Limited impact if devices are isolated behind firewalls with strict inbound filtering, though exploitation remains possible from internal networks.
🎯 Exploit Status
Public exploit code is available on GitHub, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch exists. D-Link has stated affected products are end-of-life and no longer supported.
🔧 Temporary Workarounds
Network Isolation
allPlace affected routers behind firewalls with strict inbound filtering to prevent remote exploitation.
Disable Remote Management
allEnsure router web interface is not accessible from WAN/Internet.
🧯 If You Can't Patch
- Immediately replace affected routers with supported models
- Segment affected devices on isolated VLANs with strict network access controls
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or using command: telnet [router_ip] (if enabled) and check version in system info.Check Version:
Check router web interface under 'Status' or 'System' for firmware versionVerify Fix Applied:
Since no patch exists, verification involves confirming device replacement or network isolation measures.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/wirelessApcli_5g with long parameter values
- Router crash/reboot logs
- Unusual outbound connections from router
Network Indicators:
- Exploit traffic patterns to router port 80/443
- Unusual router-to-external communications
SIEM Query:
source_ip=router_ip AND (url_path="/goform/wirelessApcli_5g" AND (param_length>100 OR response_code=500))