CVE-2026-0647: CWE-306: Missing Authentication for Critical Function in Rockwell Automation FLEX I/O EtherNet/IP Adapters
CVE-2026-0647 is a high-severity vulnerability in the Rockwell Automation FLEX I/O EtherNet/IP 1794-AENTR adapter version 2.012. The embedded web server lacks proper authentication for a critical function, allowing an unauthenticated attacker to change the device's web interface password via a crafted HTTP GET request. Exploitation could lead to unauthorized access, account takeover, and disruption of the device's web server availability.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-0647) affects the 1794-AENTR adapter's embedded web server in Rockwell Automation FLEX I/O EtherNet/IP Adapters version 2.012. Due to missing authentication controls (CWE-306), an attacker can send a specially crafted HTTP GET request to a specific endpoint without prior authentication and change the device's web interface password. This flaw enables unauthorized access and potential account takeover, impacting the device's availability and security. The CVSS 4.0 base score is 8.8, reflecting network attack vector, no privileges or user interaction required, and high impact on integrity and availability.
Potential Impact
An unauthenticated attacker can change the device's web interface password, leading to unauthorized access and account takeover. This compromises the integrity and availability of the embedded web server, potentially disrupting device operations.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented. Until a patch is available, restrict network access to the device's management interface to trusted users only.
CVE-2026-0647: CWE-306: Missing Authentication for Critical Function in Rockwell Automation FLEX I/O EtherNet/IP Adapters
Description
CVE-2026-0647 is a high-severity vulnerability in the Rockwell Automation FLEX I/O EtherNet/IP 1794-AENTR adapter version 2.012. The embedded web server lacks proper authentication for a critical function, allowing an unauthenticated attacker to change the device's web interface password via a crafted HTTP GET request. Exploitation could lead to unauthorized access, account takeover, and disruption of the device's web server availability.
CVSS v4.0
Score 8.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-0647) affects the 1794-AENTR adapter's embedded web server in Rockwell Automation FLEX I/O EtherNet/IP Adapters version 2.012. Due to missing authentication controls (CWE-306), an attacker can send a specially crafted HTTP GET request to a specific endpoint without prior authentication and change the device's web interface password. This flaw enables unauthorized access and potential account takeover, impacting the device's availability and security. The CVSS 4.0 base score is 8.8, reflecting network attack vector, no privileges or user interaction required, and high impact on integrity and availability.
Potential Impact
An unauthenticated attacker can change the device's web interface password, leading to unauthorized access and account takeover. This compromises the integrity and availability of the embedded web server, potentially disrupting device operations.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented. Until a patch is available, restrict network access to the device's management interface to trusted users only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Rockwell
- Date Reserved
- 2026-01-06T16:09:07.074Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3165080b89be6888c91b18
Added to database: 6/16/2026, 3:00:24 PM
Last enriched: 6/16/2026, 3:15:40 PM
Last updated: 6/17/2026, 5:02:18 AM
Views: 9
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