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Fencer Vulns
high 7.5

CVE-2023-2846 json

Authentication Bypass Vulnerability in MELSEC-F Series main module

published 2023-06-30 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-34297

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

Authentication Bypass by Capture-replay vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series main modules allows a remote unauthenticated attacker to cancel the password/keyword setting and login to the affected products by sending specially crafted packets.

Vendor advisories

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

cisa ICSA-23-180-04 updated cvss 7.5

Mitsubishi Electric MELSEC-F Series

  • Mitsubishi Electric FX3G-xMy/ES-A x=14,24,40,60, y=T,R Mitsubishi Electric FX3G-xMy/z x=14,24,40,60, y=T,R, z=ES,ESS,DS,DSS Mitsubishi Electric FX3GA-xMy-CM x=24,40,60, y=T,R Mitsubishi Electric FX3GC-32MT/D, FX3GC-32MT/DSS Mitsubishi Electric FX3GE-xMy/z x=24,40, y=T,R, z=ES,ESS,DS,DSS Mitsubishi Electric FX3S-30My/z-2AD y=T,R, z=ES,ESS
    +10 more products
    Mitsubishi Electric FX3S-xMy/z x=10,14,20,30, y=T,R, z=ES,ESS,DS,DSS Mitsubishi Electric FX3SA-xMy-CM x=10,14,20,30, y=T,R Mitsubishi Electric FX3U-32MR/UA1, FX3U-64MR/UA1 Mitsubishi Electric FX3U-32MS/ES, FX3U-64MS/ES Mitsubishi Electric FX3U-xMy/ES-A x=16,32,48,64,80,128, y=T,R Mitsubishi Electric FX3U-xMy/z x=16,32,48,64,80,128, y=T,R, z=ES,ESS,DS,DSS Mitsubishi Electric FX3UC-16MR/D-T, FX3UC-16MR/DS-T Mitsubishi Electric FX3UC-16MT/D-P4, FX3UC-16MR/DSS-P4 Mitsubishi Electric FX3UC-32MT-LT, FX3UC-32MT-LT-2 Mitsubishi Electric FX3UC-xMT/z x=16,32,64,96, z=D,DSS
    affected: mitigation “Mitsubishi Electric recommends customers take the following mitigation measures to minimize the risk of an attacker 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
partial
Assessed
20 mo ago

Exploit prediction

1.32% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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-16MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MR/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MT/ES
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MT/ESS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/DSS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MR/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/DS
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/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-16MR/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-16MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MR/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-32MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MR/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-48MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MR/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-64MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MR/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-80MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MR/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3U-128MT/ES-A
  • Mitsubishi Electric Corporation MELSEC-F Series FX3UC-16MT/D

Classification

Weakness
  • CWE-294 Authentication Bypass by Capture-replay

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.