CVE-2012-6439: Rockwellautomation 1756-Enbt

High severity, CVSS 8.5. EPSS: 23.2% chance of exploitation in the next 30 days.

When an affected product receives a valid CIP message from an unauthorized or unintended source to Port 2222/TCP, Port 2222/UDP, Port 44818/TCP, or Port 44818/UDP that changes the product’s configuration and network parameters, a DoS condition can occur. This situation could cause loss of availability and a disruption of communication with other connected devices.  Rockwell Automation EtherNet/IP products; 1756-ENBT, 1756-EWEB, 1768-ENBT, and 1768-EWEB communication modules; CompactLogix L32E and L35E controllers; 1788-ENBT FLEXLogix adapter; 1794-AENTR FLEX I/O EtherNet/IP adapter; ControlLogix 18 and earlier; CompactLogix 18 and earlier; GuardLogix 18 and earlier; SoftLogix 18 and earlier; CompactLogix controllers 19 and earlier; SoftLogix controllers 19 and earlier; ControlLogix controllers 20 and earlier; GuardLogix controllers 20 and earlier; and MicroLogix 1100 and 1400

Affected products

• Rockwellautomation 1756-Enbt: affected versions not specified
• Rockwellautomation 1756-Eweb: affected versions not specified
• Rockwellautomation 1768-Enbt: affected versions not specified
• Rockwellautomation 1768-Eweb: affected versions not specified
• Rockwellautomation 1794-Aentr Flex I/o Ethernet/ip Adapter: affected versions not specified
• Rockwellautomation Compactlogix: up to and including 18
• Rockwellautomation Compactlogix Controllers: up to and including 19
• Rockwellautomation Compactlogix l32e Controller: affected versions not specified
• Rockwellautomation Compactlogix l35e Controller: affected versions not specified
• Rockwellautomation Controllogix: up to and including 18
• Rockwellautomation Controllogix Controllers: up to and including 20
• Rockwellautomation Flexlogix 1788-Enbt Adapter: affected versions not specified
• Rockwellautomation Guardlogix: up to and including 18
• Rockwellautomation Guardlogix Controllers: up to and including 20
• Rockwellautomation Micrologix: up to and including 1100; up to and including 1400
• Rockwellautomation Softlogix: up to and including 18
• Rockwellautomation Softlogix Controllers: up to and including 19

Published 2013-01-24. Last modified 2026-06-16.