CVE-2025-28395
📋 TL;DR
A buffer overflow vulnerability exists in D-LINK DI-8100 routers in the ipsec_road_asp function via the host_ip parameter. This allows attackers to potentially execute arbitrary code or crash the device. Organizations using affected D-LINK DI-8100 routers with vulnerable firmware are at risk.
💻 Affected Systems
- D-LINK DI-8100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Denial of service causing router crashes and network disruption, with potential for limited code execution in constrained environments.
If Mitigated
Denial of service only, with no code execution due to modern exploit mitigations or network segmentation.
🎯 Exploit Status
Exploitation requires sending specially crafted requests to the vulnerable function. Public proof-of-concept exists in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check D-LINK security advisories for patch availability. 2. Download latest firmware from official D-LINK support site. 3. Backup current configuration. 4. Upload new firmware via web interface. 5. Restart router. 6. Restore configuration if needed.
🔧 Temporary Workarounds
Disable IPSec Road Warrior functionality
allRemove or disable the vulnerable IPSec Road Warrior feature if not required.
Restrict management access
allLimit access to router management interface to trusted IP addresses only.
🧯 If You Can't Patch
- Segment affected routers in isolated network zones with strict firewall rules
- Implement network monitoring for abnormal traffic patterns to vulnerable services
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface: System Status > Firmware Version. If version is 16.07.26A1, device is vulnerable.Check Version:
Check via web interface or SSH: show versionVerify Fix Applied:
Verify firmware version has been updated to a version later than 16.07.26A1.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to ipsec_road_asp endpoint
- Router crash/reboot logs
- Large or malformed host_ip parameter values
Network Indicators:
- Abnormal traffic patterns to router management interface
- Exploit attempt signatures in IPSec-related traffic
SIEM Query:
source="router_logs" AND (uri="*ipsec_road_asp*" OR message="*buffer overflow*" OR message="*crash*")