CVE-2025-15391
📋 TL;DR
This CVE describes a remote command injection vulnerability in D-Link DIR-806A routers via the SSDP request handler. Attackers can execute arbitrary commands on affected devices without authentication. Only products no longer supported by the vendor are affected.
💻 Affected Systems
- D-Link DIR-806A
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing attackers to install persistent malware, pivot to internal networks, or use the device for botnet activities.
Likely Case
Device takeover for use in DDoS botnets, credential theft from connected devices, or network reconnaissance.
If Mitigated
Limited impact if device is isolated from critical networks and internet access is restricted.
🎯 Exploit Status
Public exploit code exists on GitHub. Attack requires network access to SSDP service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch available. Device is end-of-life. Replace with supported hardware.
🔧 Temporary Workarounds
Disable SSDP Service
allTurn off SSDP/UPnP service to prevent exploitation
Check router admin interface for UPnP/SSDP settings
Network Segmentation
allIsolate affected devices from critical networks
🧯 If You Can't Patch
- Immediately replace affected devices with supported hardware
- Implement strict network segmentation and firewall rules blocking port 1900
🔍 How to Verify
Check if Vulnerable:
Check device model and firmware version in router admin interface. If DIR-806A with version 100CNb11, device is vulnerable.Check Version:
Check router web interface or use nmap to identify device model and firmwareVerify Fix Applied:
No fix available. Verify device replacement or workaround implementation.📡 Detection & Monitoring
Log Indicators:
- Unusual SSDP traffic patterns
- Unexpected command execution in system logs
- Port 1900 exploitation attempts
Network Indicators:
- Malformed SSDP packets to port 1900
- Command injection patterns in SSDP requests
SIEM Query:
source_port:1900 AND (payload_contains:"cmd" OR payload_contains:"exec" OR payload_contains:"system")