# CVE-2022-40267

## Summary

- **CVE ID:** CVE-2022-40267
- **Severity:** MEDIUM
- **CVSS Score:** 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)
- **CWE:** CWE-337
- **Published:** Jan 20, 2023
- **Last Modified:** Mar 13, 2026

## Description

Predictable Seed in Pseudo-Random Number Generator (PRNG) vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-xMy/z (x=32,64,80, y=T,R, z=ES,DS,ESS,DSS) with serial number 17X**** or later, and versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-xMy/z (x=32,64,80, y=T,R, z=ES,DS,ESS,DSS) with serial number 179**** and prior, and versions 1.074 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-xMy/z (x=32,64,96, y=T, z=D,DSS)) with serial number 17X**** or later, and versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-xMy/z (x=32,64,96, y=T, z=D,DSS)) with serial number 179**** and prior, and versions 1.074 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DS-TS versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS-TS versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-xMy/z (x=24,40,60, y=T,R, z=ES,ESS) versions 1.042 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-xMy/ES-A (x=24,40,60, y=T,R) versions 1.043 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-xMy/z (x=30,40,60,80, y=T,R, z=ES,ESS) versions 1.003 and prior, Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MR/DS-TS versions 1.280 and prior, Mitsubishi Electric Corporation MELSEC iQ-R Series R00/01/02CPU versions 33 and prior, Mitsubishi Electric Corporation MELSEC iQ-R Series R04/08/16/32/120(EN)CPU versions 66 and prior allows a remote unauthenticated attacker to access the Web server function by guessing the random numbers used for authentication from several used random numbers.

## Affected Products

- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MT/ES (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MT/ES (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MT/ES (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MT/ES (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Seres FX5U-80MT/ES (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Seres FX5U-80MT/ES (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MR/ES (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MR/ES (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MR/ES (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MR/ES (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MR/ES (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MR/ES (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MT/DS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MT/DS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MT/DS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MT/DS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MT/DS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MT/DS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MR/DS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MR/DS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MR/DS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MR/DS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MR/DS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MR/DS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MT/ESS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MT/ESS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MT/ESS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MT/ESS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MT/ESS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MT/ESS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MT/DSS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-32MT/DSS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MT/DSS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-64MT/DSS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MT/DSS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5U-80MT/DSS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-32MT/D (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-32MT/D (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-64MT/D (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-64MT/D (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-96MT/D (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-96MT/D (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-32MT/DSS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-32MT/DSS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-64MT/DSS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-64MT/DSS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-96MT/DSS (serial number 17X**** or later, and versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-96MT/DSS (serial number 179**** and prior, and versions 1.074 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-32MT/DS-TS (versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-32MT/DSS-TS (versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UC-32MR/DS-TS (versions 1.280 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R00CPU (versions 33 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R01CPU (versions 33 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R02CPU (versions 33 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R04CPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R08CPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R16CPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R32CPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R120CPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R04ENCPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R08ENCPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R16ENCPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R32ENCPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-R Series R120ENCPU (versions 66 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-24MT/ES (1.042 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-40MT/ES (1.042 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-60MT/ES (1.042 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-24MR/ES (1.042 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-40MR/ES (1.042 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-60MR/ES (1.042 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-24MT/ESS (1.042 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-40MT/ESS (1.042 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-60MT/ESS (1.042 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-24MT/ES-A (1.043 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-40MT/ES-A (1.043 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-60MT/ES-A (1.043 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-24MR/ES-A (1.043 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-40MR/ES-A (1.043 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5UJ-60MR/ES-A (1.043 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-30MT/ES (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-40MT/ES (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-60MT/ES (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-80MT/ES (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-30MR/ES (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-40MR/ES (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-60MR/ES (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-80MR/ES (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-30MT/ESS (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-40MT/ESS (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-60MT/ESS (1.003 and prior)
- Mitsubishi Electric Corporation — MELSEC iQ-F Series FX5S-80MT/ESS (1.003 and prior)

## References

- [CNA](https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2022-019_en.pdf)
- [CNA](https://jvn.jp/vu/JVNVU99673580/index.html)
- [CNA](https://www.cisa.gov/uscert/ics/advisories/icsa-23-017-02)
- [CVE](https://www.talosintelligence.com/vulnerability_reports/TALOS-2022-1646)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.18%
- **EPSS Percentile:** 66.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._