CVE-2025-3755Network attack vector

Information disclosure and shutdown via unvalidated packet offsets

Published May 29, 2025 · Updated Aug 27, 2025

Improper input-offset validation in Mitsubishi Electric MELSEC iQ-F Series CPU modules allows remote attackers to read data or stop service. Packet-processing logic fails to validate an index, position, or offset supplied in specially crafted network packets. No authentication or user interaction is required; successful requests can disrupt MELSOFT connections or halt the CPU module until reset.

CVSS severity9.1
Critical
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper input-offset validation in Mitsubishi Electric MELSEC iQ-F Series CPU modules allows remote attackers to read data or stop service. Packet-processing logic fails to validate an index, position, or offset supplied in specially crafted network packets. No authentication or user interaction is required; successful requests can disrupt MELSOFT connections or halt the CPU module until reset.

The record

CVE
CVE-2025-3755
Published
May 29, 2025
Updated
Aug 27, 2025
Vendor
Mitsubishi Electric Corporation
Product
MELSEC iQ-F Series FX5UJ-60MR/ES-A
Classifications
CWE-1285, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/Dversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MR/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-64MT/Dversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MR/DS-TSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-64MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DS-TSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-96MT/Dversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-30MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-96MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DSS-TSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MR/ESversion=All versions

Published CVSS scores

9.1Mitsubishi Electric CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1285Improper Validation of Specified Index, Position, or Offset in Input
T0814Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo