CVE-2012-6439

What it is

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

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

23.2% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2013-01-24 21:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:48 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 23.2% in the next 30 days (EPSS).
• Severity: 8.5 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2013-01-24 21:55 UTC

Last modified

2026-06-16 23:48 UTC

Exploit probability

23.2% · EPSS, next 30 days

Weakness

CWE-284 · Improper access control

Record status

Modified

Affected

• Rockwellautomation Controllogix Controllers ≤ 20
• Rockwellautomation Guardlogix Controllers ≤ 20
• Rockwellautomation Micrologix ≤ 1100
• Rockwellautomation Micrologix ≤ 1400
• Rockwellautomation Softlogix Controllers ≤ 19
• Rockwellautomation 1756-enbt
• Rockwellautomation 1756-eweb
• Rockwellautomation 1768-enbt

Attack profile CVSS 2.0 · 8.5

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2012-6439.md and follow it. Check whether this project is affected by CVE-2012-6439. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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