Rockwell Automation FLEX I/O EtherNet/IP Adapters

View CSAF
Summary
Successful exploitation of these vulnerabilities could allow an attacker to gain unauthorized access, account takeover, and cause loss of availability.
The following versions of Rockwell Automation FLEX I/O EtherNet/IP Adapters are affected:

1794-AENTR V2.012 (CVE-2026-0646, CVE-2026-0647)
1794-AENTRXT V2.012 (CVE-2026-0646, CVE-2026-0647)





CVSS
Vendor
Equipment
Vulnerabilities




v3 9.4
Rockwell Automation
Rockwell Automation FLEX I/O EtherNet/IP Adapters
Missing Release of Memory after Effective Lifetime, Missing Authentication for Critical Function




Background

Critical Infrastructure Sectors: Critical Manufacturing
Countries/Areas Deployed: Worldwide
Company Headquarters Location: United States


Vulnerabilities

Expand All +

CVE-2026-0646

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.
View CVE Details

Affected Products
Rockwell Automation FLEX I/O EtherNet/IP Adapters

Vendor:Rockwell Automation
Product Version:Rockwell Automation 1794-AENTR: V2.012, Rockwell Automation 1794-AENTRXT: V2.012
Product Status:known_affected


Remediations
MitigationRockwell Automation recommends users update to 2.013 to resolve these vulnerabilities.
MitigationFor more information, please visit Rockwell Automation's SD1775 https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1775.htmlhttps://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1775.html

Relevant CWE: CWE-401 Missing Release of Memory after Effective Lifetime

Metrics




CVSS Version
Base Score
Base Severity
Vector String




3.1
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H


4.0
8.7
HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N







CVE-2026-0647

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.
View CVE Details

Affected Products
Rockwell Automation FLEX I/O EtherNet/IP Adapters

Vendor:Rockwell Automation
Product Version:Rockwell Automation 1794-AENTR: V2.012, Rockwell Automation 1794-AENTRXT: V2.012
Product Status:known_affected


Remediations
MitigationRockwell Automation recommends users update to 2.013 to resolve these vulnerabilities.
MitigationFor more information, please visit Rockwell Automation's SD1775 https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1775.htmlhttps://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1775.html

Relevant CWE: CWE-306 Missing Authentication for Critical Function

Metrics




CVSS Version
Base Score
Base Severity
Vector String




3.1
9.4
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H


4.0
8.8
HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N








Acknowledgments

Rockwell Automation reported these vulnerabilities to CISA


Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).

Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities.
Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
Do not click web links or open attachments in unsolicited email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.

Revision History

Initial Release Date: 2026-06-16




Date
Revision
Summary




2026-06-16
1
Initial Republication of Rockwell Automation Security Advisory SD1775




Legal Notice and Terms of Use

https://www.cisa.gov/news-events/ics-advisories/icsa-26-167-05

2026-06-16 12:00 UTC
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