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CVE-2026-0646 is a denial-of-service vulnerability affecting Rockwell Automation FLEX I/O dual-port EtherNet/IP adapters, specifically models 1794-AENTR and 1794-AENTRXT running affected firmware such as version 2.012. The issue is caused by improper memory handling of CIP protocol requests, and the available references map it to CWE-401 (missing release of memory after effective lifetime). A remote attacker can send crafted CIP requests to the adapter and trigger a fault condition in the device. When triggered, the adapter loses connection to its associated I/O modules and does not automatically recover, requiring a manual reset to restore operation.
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No public exploit code observed for this vulnerability.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in Rockwell Automation FLEX I/O 1794-AENTR and 1794-AENTRXT adapters caused by improper memory handling of CIP requests, which can fault the adapter and sever connectivity to attached I/O modules.
A denial-of-service vulnerability in the Rockwell Automation 1794-AENTR adapter caused by improper memory handling of CIP protocol requests, which can fault the adapter and disconnect associated I/O modules until manually reset.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.