# Authentication Bypass Vulnerability in Web Server Function on MELSEC Series

CVE record · `CVE-2022-40267`

- **Identifiers:** `CVE-2022-40267`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **CNA:** Mitsubishi
- **Weakness (CWE):** [CWE-337](https://cwe.mitre.org/data/definitions/337.html)
- **Tags:** [CWE-337](https://agentprime.io/advisories/tag/cwe-337.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 Seres FX5U-80MT/ES](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-f-seres-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:** 20 Jan 2023
- **Updated:** 3 Aug 2024
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Mitsubishi) at 20 Jan 2023, 07:52 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.

## 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, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MT/ES.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Seres FX5U-80MT/ES.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MR/ES.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MR/ES.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MR/ES.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MT/DS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MT/DS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MT/DS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MR/DS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MR/DS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MR/DS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MT/ESS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MT/ESS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MT/ESS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-32MT/DSS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-64MT/DSS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5U-80MT/DSS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MT/D.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-64MT/D.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-96MT/D.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MT/DSS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-64MT/DSS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-96MT/DSS.
  - affected: `serial number 17X**** or later, and versions 1.280 and prior`
  - affected: `serial number 179**** and prior, and versions 1.074 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MT/DS-TS.
  - affected: `versions 1.280 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MT/DSS-TS.
  - affected: `versions 1.280 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-F Series FX5UC-32MR/DS-TS.
  - affected: `versions 1.280 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R00CPU.
  - affected: `versions 33 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R01CPU.
  - affected: `versions 33 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R02CPU.
  - affected: `versions 33 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R04CPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R08CPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16CPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32CPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R120CPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R04ENCPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R08ENCPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16ENCPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32ENCPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected
- Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R120ENCPU.
  - affected: `versions 66 and prior`
  - Other versions: unaffected

And 27 more products. The full list is on the CVE record: <https://www.cve.org/CVERecord?id=CVE-2022-40267>

## 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

- 5.9 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N`, from CNA (Mitsubishi)

- **CISA KEV:** Not listed.
- **EPSS:** 0.012, the 69th 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 20 Jan 2023. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2022-40267](https://www.cve.org/CVERecord?id=CVE-2022-40267)
- [NVD: CVE-2022-40267](https://nvd.nist.gov/vuln/detail/CVE-2022-40267)

### References from the CNA

- <https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2022-019_en.pdf>
- <https://jvn.jp/vu/JVNVU99673580/index.html>
- <https://www.cisa.gov/uscert/ics/advisories/icsa-23-017-02>

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-2022-40267>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2022-40267/>. Everything for agents: <https://agentprime.io/llms.txt>.