CVE-2023-49351
📋 TL;DR
A stack-based buffer overflow vulnerability in the /bin/webs binary of Edimax BR6478AC V2 routers allows attackers to execute arbitrary code or crash the device by exploiting improper use of strcpy(). This affects users running firmware version v1.23 on these specific router models.
💻 Affected Systems
- Edimax BR6478AC V2 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with root privileges leading to complete device compromise, network infiltration, and persistent backdoor installation.
Likely Case
Router crash causing denial of service, potential credential theft, and network disruption.
If Mitigated
Limited impact if device is behind firewall with no external access and strict network segmentation.
🎯 Exploit Status
Public GitHub repository contains exploit details. Buffer overflow via strcpy() is a well-understood vulnerability class with reliable exploitation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Edimax website for firmware updates. 2. Download latest firmware. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router web interface
Login to router admin → Advanced Settings → Remote Management → Disable
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected router with different model or vendor
- Implement strict firewall rules blocking all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Update sectionCheck Version:
Login to router web interface and check firmware versionVerify Fix Applied:
Verify firmware version is no longer v1.23 after update📡 Detection & Monitoring
Log Indicators:
- Multiple failed web interface access attempts
- Unusual POST requests to router web interface
- Router crash/reboot logs
Network Indicators:
- Unusual traffic patterns to router management port (typically 80/443)
- Exploit payload patterns in HTTP requests
SIEM Query:
source="router_logs" AND ("webs" OR "strcpy" OR "buffer overflow")