FLEX I/O Dual-port EtherNet/IP Adapters – Multiple Vulnerabilities
The security of our products is important to us as your industrial automation supplier. This security issue was found internally during routine testing and is being reported based on our commitment to customer transparency and improvement of all business environments.
Product Description
The 1794-AENTR from Rockwell Automation is a FLEX™ I/O EtherNet/IP adapter that connects 1794 FLEX I/O modules to an EtherNet/IP network, enabling communication between the I/O modules and Logix controllers for distributed industrial automation applications.
Affected Products and Solution
Affected Product |
CVE |
Affected Firmware Version |
Corrected in Firmware Version |
Affected Catalog Numbers |
FLEX I/O EtherNet/IP Adapters |
CVE-2026-0646 |
2.012
|
2.013 |
1794-AENTR/ 1794-AENTRXT |
FLEX I/O EtherNet/IP Adapters |
CVE-2026-0647 |
2.012 |
2.013 |
1794-AENTR/ 1794-AENTRXT |
Security Issue Details for CVE-2026-0646
Category |
Details |
CVE ID |
CVE-2026-0646 |
Impact |
A denial-of-service security issue exists within the 1794-AENTR adapter due to improper memory handling of CIP protocol requests. This vulnerability can result in the adapter faulting and losing connection to its associated I/O modules, requiring a manual reset to recover. |
CVSS 3.1 Base Score |
|
CVSS 4.0 Base Score |
|
CWE |
CWE-401 – Missing Release of Memory after Effective Lifetime |
Known Exploited Vulnerability |
No |
Security Issue Details for CVE-2026-0647
Category |
Details |
CVE ID |
CVE-2026-0647 |
Impact |
An improper authentication security issue exists within the 1794-AENTR adapter's embedded web server. The vulnerability allows an unauthenticated attacker to change the device's web interface password by sending a crafted HTTP GET request to a specific endpoint, without any prior authentication being required. If exploited, this could lead to unauthorized access, account takeover, and loss of the device’s embedded web server’s availability.
|
CVSS 3.1 Base Score |
|
CVSS 4.0 Base Score |
|
CWE |
|
Known Exploited Vulnerability |
No |
Mitigations and Workarounds
Customers using the affected software, who are not able to upgrade to one of the corrected versions, should use our security best practices.
Revision History
Revision |
Date |
Description |
1.0 |
5/20/2026 |
Initial release |
Glossary:
· Denial of Service (DoS): A malicious attempt to disrupt the normal functioning of a targeted server, service, or network by overwhelming it with a flood of traffic or triggering a crash
· CIP: Common Industrial Protocol (CIP) is a common communication standard that is widely used in industrial automation. Comprises a series of protocols for communication between different devices and systems in automation technology
· Fuzzing: a technique that focuses on discovering vulnerabilities by providing a large amount of random and unexpected data inputs to a software system to trigger faults and find implementation bugs
· Inhibited: Temporarily disabled or prevented from operating
· Authentication: The process of verifying the identity of a user or system
· Web Server: Is a software and hardware system that serves content over the internet using the Hypertext Transfer Protocol (HTTP) or its secure version HTTPS. Its primary role is to store, process, and deliver webpages to users' browsers upon request.
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Support
If you have any questions regarding the security issue(s) above and how to mitigate them, contact TechConnect for help. More information can be found at Contact Us | Rockwell Automation | US.
If you have any questions regarding this disclosure, please contact PSIRT
Email: rasecure@ra.rockwell.com
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