Rockwell FLEX I/O adapters expose critical DoS, auth bypass
Two vulnerabilities in Rockwell Automation FLEX I/O EtherNet/IP adapters allow unauthenticated attackers to cause denial of service and take over device web interfaces.
Sourcecisa.gov — open the original
What to check
- Applies to
- The 2 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CISA has published an advisory for two vulnerabilities affecting Rockwell Automation FLEX I/O EtherNet/IP adapters used in critical manufacturing environments worldwide. CVE-2026-0646 is a denial-of-service flaw caused by improper memory handling of CIP protocol requests, which can cause the adapter to fault and lose connection to associated I/O modules, requiring manual reset. CVE-2026-0647 is an authentication bypass in the embedded web server that allows unauthenticated attackers to change the device password via a crafted HTTP GET request, enabling unauthorized access and account takeover.
Both vulnerabilities affect versions 2.012 of the 1794-AENTR and 1794-AENTRXT adapters. Rockwell Automation has released version 2.013 to address these issues. The vendor self-reported these vulnerabilities to CISA, and no known public exploitation has been reported at this time.
CISA recommends affected organizations update to the patched version and implement standard ICS security practices including network segmentation, firewall protection, and restricting internet exposure of control system devices.
Mentioned in this report
Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-167-05
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