CVE-2017-11402: Belden Tofino Xenon Security Appliance Firmware

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

An issue has been discovered on the Belden Hirschmann Tofino Xenon Security Appliance before 03.2.00. Design flaws in OPC classic and in custom netfilter modules allow an attacker to remotely activate rules on the firewall and to connect to any TCP port of a protected asset, thus bypassing the firewall. The attack methodology is a crafted OPC dynamic port shift.

Affected products

• Belden Tofino Xenon Security Appliance Firmware: up to and including 3.1.0

Published 2017-11-20. Last modified 2026-06-17.