CVE-2025-5437
📋 TL;DR
This critical vulnerability in Multilaser Sirius RE016 routers allows attackers to bypass authentication on the password change handler remotely. Attackers can change administrative passwords without credentials, potentially taking full control of affected devices. All users of Multilaser Sirius RE016 MLT1.0 routers are affected.
💻 Affected Systems
- Multilaser Sirius RE016
⚠️ 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 reconfigure network settings, intercept traffic, install malware, or use the device as a pivot point into internal networks.
Likely Case
Unauthorized password changes leading to loss of administrative access, potential network disruption, and exposure of connected devices.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Python exploit script is publicly available on GitHub. The vulnerability requires no authentication and has simple exploitation steps.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor was contacted but did not respond. Consider workarounds or replacement.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to the router's web interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allTurn off remote administration features if not required
🧯 If You Can't Patch
- Isolate affected routers in separate VLANs with strict firewall rules
- Implement network monitoring for unauthorized access attempts to /cgi-bin/cstecgi.cgi
🔍 How to Verify
Check if Vulnerable:
Check if device model is Multilaser Sirius RE016 and firmware version is MLT1.0. Attempt to access /cgi-bin/cstecgi.cgi with password change parameters without authentication.Check Version:
Check router web interface at System Status or About page, or use nmap -sV -p 80,443 [ROUTER_IP]Verify Fix Applied:
No official fix available to verify. After workarounds, test that password change requires proper authentication.📡 Detection & Monitoring
Log Indicators:
- Unauthorized POST requests to /cgi-bin/cstecgi.cgi
- Multiple failed login attempts followed by successful password change
- Password change events from unexpected IP addresses
Network Indicators:
- HTTP POST requests to /cgi-bin/cstecgi.cgi with password parameters from unauthorized sources
- Unusual traffic patterns from router to external IPs
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/cstecgi.cgi" AND method="POST" AND (NOT src_ip IN [authorized_ips]))