Overview
CVE-2025-0657 identifies a vulnerability affecting Automated Logic and Carrier i-Vu Gen5 routers running driver version drv_gen5_106-01-2380. This flaw allows attackers to send malformed packets through the BACnet MS/TP network, causing the affected devices to enter a fault state, effectively leading to a denial-of-service (DoS) condition. Recovery requires a manual power cycle, significantly impacting network visibility and control.
Technical Details
The vulnerability stems from improper handling of malformed BACnet MS/TP packets by the router’s firmware. Specifically, when a specially crafted packet is received, the device fails to process it correctly, leading to a system error that results in the device entering a fault state. This state prevents the device from communicating on the network and requires manual intervention to resolve.
CVSS Analysis
Currently, the CVSS score for CVE-2025-0657 is marked as N/A, indicating that a formal severity assessment has not yet been published. However, given the potential for denial-of-service and the need for manual intervention to restore functionality, the impact could be significant in operational environments.
Possible Impact
The impact of exploiting CVE-2025-0657 can be significant, especially in building automation systems that rely on the affected routers. A successful attack can lead to:
- Denial-of-Service: Affected devices become unresponsive and unable to participate in network communications.
- Loss of Visibility: Network operators lose the ability to monitor and control affected devices.
- Operational Disruption: Building automation processes controlled by the affected devices can be disrupted, potentially impacting critical systems like HVAC or lighting.
- Manual Intervention Required: Recovering from the fault state requires a manual power cycle, increasing downtime and potentially requiring on-site personnel.
Mitigation and Patch Steps
To mitigate the risk associated with CVE-2025-0657, it is crucial to:
- Apply the Latest Firmware Update: Check the Carrier support website for firmware updates addressing this vulnerability. Apply the update as soon as it is available.
- Network Segmentation: Implement network segmentation to isolate the BACnet MS/TP network from other potentially vulnerable systems.
- Intrusion Detection Systems (IDS): Deploy intrusion detection systems to monitor network traffic for suspicious BACnet MS/TP packets.
- Access Control: Restrict access to the BACnet MS/TP network to authorized personnel only.
