> Source: [sk184306](https://support.checkpoint.com/results/sk/sk184306)

# sk184306 - Tunnel Vision Attack Prevention Solution

| Property | Value |
|----------|-------|
| Solution ID | sk184306 |
| Date Created | 2025-11-11 |
| Last Modified | 2025-11-12 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | E89.X |
| OS | Windows, macOS |

## Symptoms

- * VPN tunnel traffic may be vulnerable to route hijacking.
* Malicious or compromised DHCP servers could redirect VPN traffic outside the encrypted tunnel
* Routing table manipulations during active VPN session.
* Exposure to Tunnel Vision vulnerability.

## Cause

Tunnel Vision attacks exploit DHCP Option 121 (Classless Static Routes) to inject specific routes into the VPN client's routing table. These injected routes may override VPN-protected paths and redirect traffic to attacker-controlled infrastructure.  

Without active route monitoring, the VPN client may not detect:  

* Addition of overlapping routes
* Deletion of existing VPN routes
* Changes in route metrics or parameters that redirect traffic

## Solution

This solution requires authentication. Please log in to view the full solution.

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