CVE-2025-5876
📋 TL;DR
This vulnerability allows remote attackers to bypass authentication on Lucky Technology LM-520 series devices. Affected systems include LM-520-SC, LM-520-FSC, and LM-520-FSC-SAM models. The vulnerability exists due to missing authentication in an unknown functionality.
💻 Affected Systems
- Lucky LM-520-SC
- Lucky LM-520-FSC
- Lucky LM-520-FSC-SAM
⚠️ 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
Attackers gain unauthorized access to device management interfaces, potentially compromising device configuration, data, or enabling further attacks.
Likely Case
Unauthorized access to administrative functions, configuration changes, or data extraction from vulnerable devices.
If Mitigated
Limited impact if devices are behind firewalls with strict access controls and network segmentation.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making this easily exploitable by attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor has not responded to disclosure. Consider workarounds or replacement if possible.
🔧 Temporary Workarounds
Network Segmentation and Access Control
allIsolate affected devices in separate network segments with strict firewall rules limiting access to trusted IPs only.
Disable Remote Management
allIf possible, disable remote management interfaces and require physical access for configuration changes.
🧯 If You Can't Patch
- Implement strict network access controls allowing only necessary traffic from trusted sources
- Monitor network traffic to/from affected devices for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check device model and firmware version. If using LM-520-SC, LM-520-FSC, or LM-520-FSC-SAM with firmware dated 20250321 or earlier, device is vulnerable.Check Version:
Check device web interface or console for firmware version information (specific command varies by device configuration).Verify Fix Applied:
No official fix available. Verify workarounds by testing authentication requirements from untrusted networks.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to management interfaces
- Authentication bypass attempts
- Configuration changes from unexpected sources
Network Indicators:
- Unexpected traffic to device management ports (typically 80, 443, or proprietary ports)
- Access from unauthorized IP addresses
SIEM Query:
source_ip NOT IN (trusted_ips) AND dest_port IN (80, 443, device_management_ports) AND dest_ip IN (affected_devices)