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Fencer Vulns
critical 9.1

CVE-2023-4562 json

Information Disclosure, Information Tampering and Authentication Bypass Vulnerability in MELSEC-F Series main module

published 2023-10-13 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-54417

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

Improper Authentication vulnerability in Mitsubishi Electric Corporation MELSEC-F Series main modules allows a remote unauthenticated attacker to obtain sequence programs from the product or write malicious sequence programs or improper data in the product without authentication by sending illegitimate messages.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-23-285-13 updated cvss 9.1

Mitsubishi Electric MELSEC-F Series

  • Mitsubishi Electric Corporation MELSEC-F FX3G-xMy/ES-A x=14,24,40,60, y=T,R Mitsubishi Electric Corporation MELSEC-F FX3G-xMy/z x=14,24,40,60, y=T,R, z=ES,ESS,DS,DSS Mitsubishi Electric Corporation MELSEC-F FX3GA-xMy-CM x=24,40,60, y=T,R Mitsubishi Electric Corporation MELSEC-F FX3GC-32MT/D, FX3GC-32MT/DSS Mitsubishi Electric Corporation MELSEC-F FX3GE-xMy/z x=24,40, y=T,R, z=ES,ESS,DS,DSS Mitsubishi Electric Corporation MELSEC-F FX3S-30My/z-2AD y=T,R, z=ES,ESS
    +10 more products
    Mitsubishi Electric Corporation MELSEC-F FX3S-xMy/z x=10,14,20,30, y=T,R, z=ES,ESS,DS,DSS Mitsubishi Electric Corporation MELSEC-F FX3SA-xMy-CM x=10,14,20,30, y=T,R Mitsubishi Electric Corporation MELSEC-F FX3U-32MS/ES, FX3U-64MS/ES Mitsubishi Electric Corporation MELSEC-F FX3U-xMy/ES-A x=16,32,48,64,80,128, y=T,R Mitsubishi Electric Corporation MELSEC-F FX3UC-16MR/D-T, FX3UC-16MR/DS-T Mitsubishi Electric Corporation MELSEC-F FX3UC-16MT/D-P4, FX3UC-16MT/DSS-P4 Mitsubishi Electric Corporation MELSEC-F FX3UC-32MT-LT, FX3UC-32MT-LT-2 Mitsubishi Electric Corporation MELSEC-F FX3UC-xMT/z x=16,32,64,96, z=D,DSS Mitsubishi Electric Corporation MELSEC-F series FX3U-32MR/UA1, FX3U-64MR/UA1 Mitsubishi Electric Corporation MELSEC-F series FX3U-xMy/z x=16,32,48,64,80,128, y=T,R, z=ES,ESS,DS,DSS
    affected: mitigation “Mitsubishi Electric recommends that customers take the following mitigation measures to minimize the risk of exploiting this vulnerability:” mitsubishielectric.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
20 mo ago

Exploit prediction

1.21% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MR/UA1
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MR/UA1
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MS/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MS/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MR/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MR/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MR/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MR/ES-A

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.