CVE-2026-0646: CWE-401 – Missing Release of Memory after Effective Lifetime in Rockwell Automation FLEX I/O EtherNet/IP Adapters
CVE-2026-0646 is a high-severity vulnerability in Rockwell Automation FLEX I/O EtherNet/IP Adapters, specifically the 1794-AENTR model version 2.012. It involves improper memory handling of CIP protocol requests, leading to a denial-of-service condition where the adapter faults and loses connection to its I/O modules, requiring manual reset.
AI Analysis
Technical Summary
This vulnerability (CWE-401) in the 1794-AENTR adapter of Rockwell Automation's FLEX I/O EtherNet/IP Adapters is caused by missing release of memory after its effective lifetime during processing of CIP protocol requests. This improper memory management can cause the adapter to fault and disconnect from associated I/O modules, disrupting operations until a manual reset is performed. The CVSS 4.0 base score is 8.7, indicating high severity with network attack vector, no privileges or user interaction required, and high impact on availability.
Potential Impact
Successful exploitation results in denial-of-service by causing the affected adapter to fault and lose connectivity with its I/O modules, interrupting industrial control processes until manual intervention resets the device. There is no indication of data confidentiality or integrity impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, manual reset is required to recover from faults caused by this vulnerability.
CVE-2026-0646: CWE-401 – Missing Release of Memory after Effective Lifetime in Rockwell Automation FLEX I/O EtherNet/IP Adapters
Description
CVE-2026-0646 is a high-severity vulnerability in Rockwell Automation FLEX I/O EtherNet/IP Adapters, specifically the 1794-AENTR model version 2.012. It involves improper memory handling of CIP protocol requests, leading to a denial-of-service condition where the adapter faults and loses connection to its I/O modules, requiring manual reset.
CVSS v4.0
Score 8.7high
Affected software
pkg:github/rockwellautomation/flex-io-ethernet-ip-adaptersRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-401) in the 1794-AENTR adapter of Rockwell Automation's FLEX I/O EtherNet/IP Adapters is caused by missing release of memory after its effective lifetime during processing of CIP protocol requests. This improper memory management can cause the adapter to fault and disconnect from associated I/O modules, disrupting operations until a manual reset is performed. The CVSS 4.0 base score is 8.7, indicating high severity with network attack vector, no privileges or user interaction required, and high impact on availability.
Potential Impact
Successful exploitation results in denial-of-service by causing the affected adapter to fault and lose connectivity with its I/O modules, interrupting industrial control processes until manual intervention resets the device. There is no indication of data confidentiality or integrity impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, manual reset is required to recover from faults caused by this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Rockwell
- Date Reserved
- 2026-01-06T16:08:44.716Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3165080b89be6888c91b15
Added to database: 6/16/2026, 3:00:24 PM
Last enriched: 6/16/2026, 3:16:41 PM
Last updated: 6/17/2026, 5:02:46 AM
Views: 12
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.