CVE-2025-50405
📋 TL;DR
The Intelbras RX1500 Router firmware versions up to v2.2.17 have incorrect access control in the FirmwareUpload and GetFirmwareValidation functions. This allows attackers to bypass authentication and upload malicious firmware or manipulate firmware validation. All users of affected router versions are vulnerable.
💻 Affected Systems
- Intelbras RX1500 Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing persistent backdoor installation, traffic interception, network pivoting, and bricking of devices.
Likely Case
Unauthenticated attackers gaining administrative control over the router to modify settings, intercept traffic, or disrupt network connectivity.
If Mitigated
Limited impact if network segmentation isolates routers and external access is restricted, though internal threats remain.
🎯 Exploit Status
The GitHub reference shows detailed exploitation steps requiring minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.intelbras.com/en
Restart Required: Yes
Instructions:
1. Check Intelbras website for firmware updates. 2. If update available, download from official source. 3. Upload via admin interface. 4. Reboot router after installation.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router admin interface
Access router admin panel > Disable 'Remote Management' or 'WAN Access' in administration settings
Network segmentation
allIsolate router management interface to trusted network segment
Configure firewall rules to restrict access to router IP on ports 80/443 to trusted IPs only
🧯 If You Can't Patch
- Replace vulnerable routers with updated models or different vendors
- Implement strict network monitoring for unauthorized firmware upload attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 2.2.17 or lower, device is vulnerable.Check Version:
Login to router admin interface and check System Status or Firmware Information pageVerify Fix Applied:
After updating, verify firmware version is higher than 2.2.17 and test that unauthorized firmware upload attempts fail.📡 Detection & Monitoring
Log Indicators:
- Unauthorized firmware upload attempts in router logs
- Unexpected firmware version changes
- Failed authentication attempts followed by firmware operations
Network Indicators:
- HTTP POST requests to firmware upload endpoints from unauthorized sources
- Unusual traffic patterns to/from router management interface
SIEM Query:
source="router_logs" AND (event="firmware_upload" OR event="firmware_validation") AND user="anonymous"