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Fencer Intel
critical 9.1

CVE-2025-3755 json

Information Disclosure and Denial-of-Service(DoS) Vulnerability in MELSEC iQ-F Series CPU module

published last yr. modified 4mo ago also EUVD-2025-16363

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

Improper Validation of Specified Index, Position, or Offset in Input vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series CPU modules allows a remote unauthenticated attacker to read information in the product, to cause a Denial-of-Service (DoS) condition in MELSOFT connection, or to stop the operation of the CPU module (causing a DoS condtion on the CPU module), by sending specially crafted packets. The product is needed to reset for recovery.

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Vendor advisories

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

cisa ICSA-25-153-03 updated cvss 9.1

Mitsubishi Electric MELSEC iQ-F Series

  • Mitsubishi Electric FX5S-30MR/DS Mitsubishi Electric FX5S-30MR/DSS Mitsubishi Electric FX5S-30MR/ES Mitsubishi Electric FX5S-30MR/ESS Mitsubishi Electric FX5S-30MT/DS Mitsubishi Electric FX5S-30MT/DSS
    +34 more products
    Mitsubishi Electric FX5S-30MT/ES Mitsubishi Electric FX5S-30MT/ESS Mitsubishi Electric FX5S-40MR/DS Mitsubishi Electric FX5S-40MR/DSS Mitsubishi Electric FX5S-40MR/ES Mitsubishi Electric FX5S-40MR/ESS Mitsubishi Electric FX5S-40MT/DS Mitsubishi Electric FX5S-40MT/DSS Mitsubishi Electric FX5S-40MT/ES Mitsubishi Electric FX5S-40MT/ESS Mitsubishi Electric FX5S-60MR/DS Mitsubishi Electric FX5S-60MR/DSS Mitsubishi Electric FX5S-60MR/ES Mitsubishi Electric FX5S-60MR/ESS Mitsubishi Electric FX5S-60MT/DS Mitsubishi Electric FX5S-60MT/DSS Mitsubishi Electric FX5S-60MT/ES Mitsubishi Electric FX5S-60MT/ESS Mitsubishi Electric FX5S-80MR/DS Mitsubishi Electric FX5S-80MR/DSS Mitsubishi Electric FX5S-80MR/ES Mitsubishi Electric FX5S-80MR/ESS Mitsubishi Electric FX5S-80MT/DS Mitsubishi Electric FX5S-80MT/DSS Mitsubishi Electric FX5S-80MT/ES Mitsubishi Electric FX5S-80MT/ESS Mitsubishi Electric FX5U-32MR/DS Mitsubishi Electric FX5U-32MR/DSS Mitsubishi Electric FX5U-32MR/ES Mitsubishi Electric FX5U-32MR/ESS Mitsubishi Electric FX5U-32MT/DS Mitsubishi Electric FX5U-32MT/DSS Mitsubishi Electric FX5U-32MT/ES Mitsubishi Electric FX5U-32MT/ESS
    affected: mitigation “Mitsubishi Electric recommends that customers take the following mitigation measures to minimize the risk of exploiting this vulnerability:” mitsubishielectric.com

55 more affected in the full advisory

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
last yr.

Exploit prediction

0.86% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-09).

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:N/A:H

Affected products

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

Classification

Weakness
  • CWE-1285 Improper Validation of Specified Index, Position, or Offset in Input

References

Sources

Fencer Intel 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.