CVE-2026-3101
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary operating system commands on Intelbras TIP 635G routers through the Ping Handler component. Successful exploitation leads to remote code execution with root privileges. Organizations using affected Intelbras TIP 635G routers are at risk.
💻 Affected Systems
- Intelbras TIP 635G
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level access, allowing attackers to install persistent backdoors, pivot to internal networks, exfiltrate data, or disrupt network operations.
Likely Case
Attackers gain full control of the router, enabling network traffic interception, credential theft, and lateral movement to connected systems.
If Mitigated
Limited impact if proper network segmentation, authentication controls, and monitoring are in place to detect and contain exploitation attempts.
🎯 Exploit Status
Exploit details are publicly available. Attack requires authentication but could be combined with default credentials or credential theft.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Contact Intelbras support for firmware updates. If unavailable, implement workarounds and consider replacing affected devices.
🔧 Temporary Workarounds
Disable Ping Handler Service
linuxDisable or restrict access to the vulnerable Ping Handler component if not required for operations.
Check device documentation for service management commands
Network Access Control
allRestrict management interface access to trusted IP addresses only.
Configure firewall rules to limit access to router management interface
🧯 If You Can't Patch
- Isolate affected routers in a separate network segment with strict firewall rules
- Implement multi-factor authentication and strong password policies for router management
🔍 How to Verify
Check if Vulnerable:
Check if device is Intelbras TIP 635G running version 1.12.3.5. Review logs for unusual ping handler activity or command execution attempts.Check Version:
Check web interface or CLI for firmware version informationVerify Fix Applied:
Test if command injection via Ping Handler is still possible. Verify firmware version has been updated if patch becomes available.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by ping handler activity
- Suspicious processes spawned from router services
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns indicating data exfiltration
- Unexpected network configuration changes
SIEM Query:
source="router_logs" AND ("ping handler" OR "command injection" OR "os command")