CVE-2025-52379
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary operating system commands on Nexxt Solutions NCM-X1800 Mesh Routers by exploiting improper input sanitization in the firmware update feature. Attackers with valid credentials can achieve remote code execution, potentially compromising the entire device. Only users of affected firmware versions are impacted.
💻 Affected Systems
- Nexxt Solutions NCM-X1800 Mesh Router
⚠️ 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 takeover allowing attackers to install persistent backdoors, intercept all network traffic, pivot to internal networks, or brick the device.
Likely Case
Attackers with stolen or default credentials gain shell access to modify configurations, steal credentials, or use the device as a foothold for further attacks.
If Mitigated
With strong authentication and network segmentation, impact is limited to the device itself without lateral movement.
🎯 Exploit Status
Public exploit code available on GitHub. Requires authentication but command injection is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates. 2. Download latest firmware. 3. Log into router web interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot device.
🔧 Temporary Workarounds
Block Web Interface Access
linuxRestrict access to router web interface from untrusted networks
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Change Default Credentials
allReplace any default or weak passwords with strong unique credentials
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Implement network monitoring for unusual outbound connections from the router
🔍 How to Verify
Check if Vulnerable:
Check firmware version in web interface under System Status or similar menu. If version is UV1.2.7 or lower, device is vulnerable.Check Version:
curl -k -u admin:password https://router-ip/status.cgi | grep firmwareVerify Fix Applied:
After updating, verify firmware version shows higher than UV1.2.7. Test that firmware update functionality works without command injection.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /web/um_fileName_set.cgi or /web/um_web_upgrade.cgi with shell metacharacters
- Multiple failed login attempts followed by successful login and firmware update attempts
Network Indicators:
- Outbound connections from router to unexpected external IPs
- Unusual traffic patterns from router management interface
SIEM Query:
source="router_logs" AND (uri="/web/um_fileName_set.cgi" OR uri="/web/um_web_upgrade.cgi") AND (param="upgradeFileName" AND value MATCHES "[;&|`$()]+")