CVE-2020-6086: Rockwellautomation Flex I/o 1794-Aent/b Firmware

High severity, CVSS 7.5. EPSS: 4.3% chance of exploitation in the next 30 days.

An exploitable denial of service vulnerability exists in the ENIP Request Path Data Segment functionality of Allen-Bradley Flex IO 1794-AENT/B. A specially crafted network request can cause a loss of communications with the device resulting in denial-of-service. An attacker can send a malicious packet to trigger this vulnerability.If the Simple Segment Sub-Type is supplied, the device treats the byte following as the Data Size in words. When this value represents a size greater than what remains in the packet data, the device enters a fault state where communication with the device is lost and a physical power cycle is required.

Affected products

• Rockwellautomation Flex I/o 1794-Aent/b Firmware: version 4.003 only

Published 2020-10-14. Last modified 2026-06-17.