Skip to content
Fencer Vulns
medium 5.3

CVE-2023-4625 json

Denial-of-Service（DoS） Vulnerability in Web server function on MELSEC Series CPU module

published 2023-11-06 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-54478

cvss
5.3
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

Improper Restriction of Excessive Authentication Attempts vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F/iQ-R Series CPU modules Web server function allows a remote unauthenticated attacker to prevent legitimate users from logging into the Web server function for a certain period after the attacker has attempted to log in illegally by continuously attempting unauthorized login to the Web server function. The impact of this vulnerability will persist while the attacker continues to attempt unauthorized login.

Vendor advisories

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

cisa ICSA-23-306-02 updated cvss 5.3

Mitsubishi Electric MELSEC iQ-F/iQ-R Series CPU Module (Update A)

  • Mitsubishi Electric FX5S-xMy/z x=30,40,60,80*, y=T,R, z=ES,ESS Mitsubishi Electric FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS (Serial number 17X**** and later) Mitsubishi Electric FX5U-xMy/z x=32,64,80, y=T,R, z=ES,DS,ESS,DSS (Serial number 179**** and prior) >=1.060 Mitsubishi Electric FX5UC-32MT/DS-TS, FX5UC-32MT/DSS-TS, FX5UC-32MR/DS-TS Mitsubishi Electric FX5UC-xMy/z x=32,64,96, y=T, z=D,DSS (Serial number 17X**** and later) Mitsubishi Electric FX5UC-xMy/z x=32,64,96, y=T, z=D,DSS (Serial number 179**** and prior) >=1.060
    +5 more products
    Mitsubishi Electric FX5UJ-xMy/ES-A* x=24,40,60, y=T,R Mitsubishi Electric FX5UJ-xMy/z x=24,40,60, y=T,R, z=ES,DS,ESS,DSS Mitsubishi Electric R00/01/02CPU >=05 Mitsubishi Electric R04/08/16/32/120(EN)CPU >=35 Mitsubishi Electric R08/16/32/120/PCPU >=37
    affected: mitigation “Mitsubishi Electric recommends that users take the following mitigation measures to minimize the risk:” 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

1.34% 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 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/D
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/D
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/D
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DS-TS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS-TS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MR/DS-TS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ES-A
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ES-A
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ES-A
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/ES-A
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/ES-A

Classification

Weakness
  • CWE-307 Improper Restriction of Excessive Authentication Attempts

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.