# CVE-2026-0646: Rockwell Automation 1794-AENTR denial of service via CIP requests

Source: https://junglewise.ai/threats/cve-2026-0646-rockwell-automation-1794-aentr-denial-of-service-via-cip-requests  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-16. Updated: 2026-06-16  
License: CC BY 4.0 with a link back

CVE-2026-0646 · Severity: info · CVSS 8.7 · Published 2026-06-16

The Rockwell Automation 1794-AENTR is a communication adapter used in industrial settings to connect input/output modules to a control network. A security flaw in how this device handles network traffic can cause it to crash and lose connection to its connected hardware. If exploited, this would disrupt industrial processes and require a manual physical reset of the device to restore operations.

Vendors: [Rockwell Automation](https://junglewise.ai/threats/vendors/rockwell-automation).

## Quick answers

**Is CVE-2026-0646 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-0646 being exploited in the wild.

**How severe is CVE-2026-0646?** Informational severity, with a CVSS score of 8.7, published 16 June 2026.

**Which products and versions are affected?** Rockwell Automation 1794-AENTR FLEX I/O EtherNet/IP Adapter 2.012; Rockwell Automation 1794-AENTRXT FLEX I/O EtherNet/IP Adapter 2.012.

**Is there a fix for CVE-2026-0646?** A patch was published on 2026-06-16: Firmware version 2.013 released to address the issue Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-0646 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-0646?** Check whether you run Rockwell Automation 1794-AENTR FLEX I/O EtherNet/IP Adapter or Rockwell Automation 1794-AENTRXT FLEX I/O EtherNet/IP Adapter at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A denial-of-service vulnerability exists in the Rockwell Automation 1794-AENTR and 1794-AENTRXT FLEX I/O EtherNet/IP adapters due to improper memory handling (CWE-401: Missing Release of Memory after Effective Lifetime). An unauthenticated attacker can exploit this by sending crafted Common Industrial Protocol (CIP) requests over the network. Successful exploitation causes the adapter to enter a fault state and lose communication with its associated I/O modules. Recovery from this state requires a manual reset of the hardware. The vulnerability is addressed in firmware version 2.013.

## Affected products

- Rockwell Automation 1794-AENTR / 1794-AENTRXT FLEX I/O EtherNet/IP Adapters 2.012

## Timeline

- 2026-05-20: disclosed: Initial internal release date noted in revision history
- 2026-06-16: advisory: Public advisory published by Rockwell Automation and NVD
- 2026-06-16: patched: Firmware version 2.013 released to address the issue

## References

- [https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1775.html](https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1775.html)

## Related threats

- [Rockwell Automation 1794-AENTR improper authentication in web server](https://junglewise.ai/threats/cve-2026-0647-rockwell-automation-1794-aentr-improper-authentication-in-web)