CVE-2022-40267
Authentication Bypass Vulnerability in Web Server Function on MELSEC Series
- Published
- Updated
- Reserved
- Assigned by
- Mitsubishi
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.
Timeline
ID reserved
By Mitsubishi
- 4 months later
· 4 months later
Published
- 19 months later
· 19 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| MitsubishiCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Modified | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 1.2% · top 31% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · 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
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DS-TS
- affected versions 1.280 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DSS-TS
- affected versions 1.280 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MR/DS-TS
- affected versions 1.280 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R00CPU
- affected versions 33 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R01CPU
- affected versions 33 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R02CPU
- affected versions 33 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R04CPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R08CPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R16CPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R32CPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R120CPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R04ENCPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R08ENCPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R16ENCPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R32ENCPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R120ENCPU
- affected versions 66 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/ES
- affected 1.042 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ES
- affected 1.042 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ES
- affected 1.042 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MR/ES
- affected 1.042 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/ES
- affected 1.042 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/ES
- affected 1.042 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/ESS
- affected 1.042 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ESS
- affected 1.042 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ESS
- affected 1.042 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/ES-A
- affected 1.043 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ES-A
- affected 1.043 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ES-A
- affected 1.043 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MR/ES-A
- affected 1.043 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/ES-A
- affected 1.043 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/ES-A
- affected 1.043 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/ES
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/ES
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/ES
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MT/ES
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MR/ES
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MR/ES
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MR/ES
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MR/ES
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/ESS
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/ESS
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/ESS
- affected 1.003 and prior
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MT/ESS
- affected 1.003 and prior
References (4)
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2022-019_en.pdf (opens in a new tab)x_transferred
- https://jvn.jp/vu/JVNVU99673580/index.html (opens in a new tab)x_transferred
- https://www.cisa.gov/uscert/ics/advisories/icsa-23-017-02 (opens in a new tab)x_transferred
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2022-1646 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-40267)Record last updated .