# Denial-of-Service and Remote Code Execution Vulnerability in MELSEC Series CPU module

CVE record · `CVE-2023-1424`

- **Identifiers:** `CVE-2023-1424`
- **State:** Confirmed
- **Severity:** CVSS 10.0 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Mitsubishi
- **Weakness (CWE):** [CWE-120](https://cwe.mitre.org/data/definitions/120.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md)
- **Technologies:** [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ES](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-32mt-es.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ES](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-64mt-es.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ES](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-80mt-es.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/ES](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-32mr-es.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/ES](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-64mr-es.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/ES](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-80mr-es.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-32mt-ds.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-64mt-ds.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-80mt-ds.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/DS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-32mr-ds.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/DS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-64mr-ds.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/DS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-80mr-ds.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ESS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-32mt-ess.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ESS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-64mt-ess.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ESS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-80mt-ess.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DSS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-32mt-dss.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DSS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-64mt-dss.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DSS](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5u-80mt-dss.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/D](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5uc-32mt-d.md) · [Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/D](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-series-fx5uc-64mt-d.md)
- **Published:** 24 May 2023
- **Updated:** 5 Mar 2025
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Mitsubishi) at 24 May 2023, 04:39 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Critical

Critical, because:

- CVSS score 10.0: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MT/ES.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MT/ES.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MT/ES.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MR/ES.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MR/ES.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MR/ES.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MT/DS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MT/DS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MT/DS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MR/DS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MR/DS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MR/DS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MT/ESS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MT/ESS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MT/ESS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MT/DSS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MT/DSS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MT/DSS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MT/D.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-64MT/D.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-96MT/D.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MT/DSS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-64MT/DSS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-96MT/DSS.
  - affected: `Serial number 17X**** or later, versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MT/DS-TS.
  - affected: `versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MT/DSS-TS.
  - affected: `versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MR/DS-TS.
  - affected: `versions from 1.220 to 1.281`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R00CPU.
  - affected: `versions 35 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R01CPU.
  - affected: `versions 35 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R02CPU.
  - affected: `versions 35 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R04CPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R08CPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16CPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32CPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R120CPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R04ENCPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R08ENCPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16ENCPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32ENCPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R120ENCPU.
  - affected: `versions from 12 to 68`
  - Other versions: unaffected

And 8 more products. The full list is on the CVE record: <https://www.cve.org/CVERecord?id=CVE-2023-1424>

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 10.0 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`, from CNA (Mitsubishi)

- **CISA KEV:** Not listed.
- **EPSS:** 0.034, the 89th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 24 May 2023. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2023-1424](https://www.cve.org/CVERecord?id=CVE-2023-1424)
- [NVD: CVE-2023-1424](https://nvd.nist.gov/vuln/detail/CVE-2023-1424)

### References from the CNA

- <https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-003_en.pdf>
- <https://jvn.jp/vu/JVNVU94650413>
- <https://www.cisa.gov/news-events/ics-advisories/icsa-23-143-03>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2023-1424>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2023-1424/>. Everything for agents: <https://agentprime.io/llms.txt>.