CVE-2024-40083
📋 TL;DR
A buffer overflow vulnerability in Vilo 5 Mesh WiFi System allows remote, unauthenticated attackers to execute arbitrary code by sending specially crafted JSON data. This affects all Vilo 5 Mesh WiFi Systems running firmware version 5.16.1.33 or earlier. Attackers can potentially take full control of affected devices without authentication.
💻 Affected Systems
- Vilo 5 Mesh WiFi System
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify device settings, intercept network traffic, or use the device as a pivot point for attacking other network devices.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
The vulnerability is in a simple sscanf function with no authentication required, making exploitation straightforward. Public proof-of-concept code is available in the GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: > 5.16.1.33
Vendor Advisory: http://vilo.com
Restart Required: Yes
Instructions:
1. Log into Vilo management interface. 2. Navigate to Settings > Firmware Update. 3. Check for and install any available updates. 4. Reboot the device after update completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Vilo devices from internet and sensitive internal networks
Firewall Rules
linuxBlock external access to Vilo management interface (typically port 80/443)
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Disable remote management and ensure Vilo devices are not accessible from the internet
- Implement strict network segmentation to contain potential compromise
🔍 How to Verify
Check if Vulnerable:
Check firmware version in Vilo management interface under Settings > About. If version is 5.16.1.33 or lower, device is vulnerable.Check Version:
curl -s http://vilo-ip/status | grep versionVerify Fix Applied:
Verify firmware version is greater than 5.16.1.33 after update. Test by attempting to send malformed JSON to the management interface and confirming proper error handling.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to management interface with malformed JSON
- Multiple failed authentication attempts followed by buffer overflow patterns
- Process crashes in local_app_set_router_token function
Network Indicators:
- Unusual outbound connections from Vilo devices
- Traffic to known exploit servers or C2 infrastructure
- Port scanning originating from Vilo devices
SIEM Query:
source="vilo.logs" AND ("sscanf" OR "buffer overflow" OR "malformed JSON")