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 Rockwell Automation FLEX I/O EtherNet/IP Adapters, specifically the 1794-AENTR model. It involves missing authentication on the device's embedded web server, allowing an unauthenticated attacker to change the 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. The affected version is 2.012. No official patch or remediation guidance has been provided yet.
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. Due to missing authentication controls on a critical function, an attacker can send a specially crafted HTTP GET request to change the device's web interface password without any prior authentication. This flaw enables unauthorized access and potential account takeover, as well as loss of availability of the embedded web server. The CVSS 4.0 base score is 8.8, reflecting network attack vector, no required privileges or user interaction, and high impact on integrity and availability. The affected version explicitly identified is 2.012. No patch or official remediation level has been disclosed by the vendor as of the publication date.
Potential Impact
An attacker can remotely change the web interface password of the affected device without authentication, leading to unauthorized access and account takeover. This compromises the device's security and may disrupt the availability of its embedded web server, potentially affecting operational continuity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict network access to the device's embedded web server to trusted sources only and monitor for suspicious HTTP GET requests targeting the password change endpoint.
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 Rockwell Automation FLEX I/O EtherNet/IP Adapters, specifically the 1794-AENTR model. It involves missing authentication on the device's embedded web server, allowing an unauthenticated attacker to change the 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. The affected version is 2.012. No official patch or remediation guidance has been provided yet.
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. Due to missing authentication controls on a critical function, an attacker can send a specially crafted HTTP GET request to change the device's web interface password without any prior authentication. This flaw enables unauthorized access and potential account takeover, as well as loss of availability of the embedded web server. The CVSS 4.0 base score is 8.8, reflecting network attack vector, no required privileges or user interaction, and high impact on integrity and availability. The affected version explicitly identified is 2.012. No patch or official remediation level has been disclosed by the vendor as of the publication date.
Potential Impact
An attacker can remotely change the web interface password of the affected device without authentication, leading to unauthorized access and account takeover. This compromises the device's security and may disrupt the availability of its embedded web server, potentially affecting operational continuity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict network access to the device's embedded web server to trusted sources only and monitor for suspicious HTTP GET requests targeting the password change endpoint.
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: 06/16/2026, 15:00:24 UTC
Last enriched: 06/23/2026, 15:17:10 UTC
Last updated: 08/01/2026, 07:17:58 UTC
Views: 69
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