CVE-2025-7762
📋 TL;DR
This critical vulnerability in D-Link DI-8100 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the HTTP request handler. Attackers can exploit this by sending specially crafted requests to the /menu_nat_more.asp endpoint. Organizations using affected D-Link DI-8100 routers with the vulnerable firmware version 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 system compromise, router takeover, lateral movement into internal networks, and persistent backdoor installation.
Likely Case
Router compromise allowing traffic interception, network disruption, credential theft, and use as pivot point for further attacks.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Exploit details are publicly available on GitHub, making weaponization probable. The buffer overflow manipulation is documented with technical specifics.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.dlink.com/
Restart Required: Yes
Instructions:
1. Check D-Link's official website for security advisories. 2. If a patch is released, download the firmware update. 3. Backup router configuration. 4. Upload and apply the new firmware via web interface. 5. Reboot the router. 6. Verify the update was successful.
🔧 Temporary Workarounds
Disable Web Management Interface
allPrevents exploitation by disabling the vulnerable HTTP handler component
Access router CLI via SSH/Telnet
Navigate to web management settings
Disable web interface or restrict to local access only
Network Access Control
linuxRestrict access to router management interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Isolate affected routers in a dedicated VLAN with strict firewall rules preventing inbound internet access to management interfaces
- Implement network monitoring and intrusion detection specifically for anomalous HTTP requests to /menu_nat_more.asp
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status > Firmware Version or via CLI command 'show version'Check Version:
show versionVerify Fix Applied:
Verify firmware version has changed from 16.07.26A1 to a newer patched version📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /menu_nat_more.asp with unusually long parameters
- Router crash/reboot logs following HTTP requests
- Unusual process creation or memory usage spikes
Network Indicators:
- HTTP POST/GET requests to /menu_nat_more.asp with buffer overflow patterns
- Unusual outbound connections from router to external IPs
SIEM Query:
source="router_logs" AND (url="/menu_nat_more.asp" AND (param_length>1000 OR contains(param,"\x90\x90")))🔗 References
- https://github.com/XiDP0/MyCVE/blob/main/CVE/D-Link%20DI_8100-16.07.26A1/menu_nat_more_asp/menu_nat_more_asp.md
- https://vuldb.com/?ctiid.316757
- https://vuldb.com/?id.316757
- https://vuldb.com/?submit.615796
- https://www.dlink.com/
- https://github.com/XiDP0/MyCVE/blob/main/CVE/D-Link%20DI_8100-16.07.26A1/menu_nat_more_asp/menu_nat_more_asp.md
