CVE-2025-5514Network attack vector

Web-service denial via inconsistent HTTP request length

Published Aug 25, 2025 · Updated Aug 26, 2025

CWE-130 in MELSEC iQ-F CPU module web servers allows remote attackers to delay HTTP processing and block legitimate web access. The request parser mishandles a length parameter that is inconsistent with its associated HTTP data, leaving web-server processing delayed. Unauthenticated network access to the enabled web server is sufficient; the bounded consequence is loss of web-server use, not loss of PLC control.

CVSS severity5.3
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CWE-130 in MELSEC iQ-F CPU module web servers allows remote attackers to delay HTTP processing and block legitimate web access. The request parser mishandles a length parameter that is inconsistent with its associated HTTP data, leaving web-server processing delayed. Unauthenticated network access to the enabled web server is sufficient; the bounded consequence is loss of web-server use, not loss of PLC control.

The record

CVE
CVE-2025-5514
Published
Aug 25, 2025
Updated
Aug 26, 2025
Vendor
Mitsubishi Electric Corporation
Product
MELSEC iQ-F Series FX5UJ-60MR/ES-A
Classifications
CWE-130, CAPEC-47, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-60MT/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/DSSversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MR/ESversion=1.060 and later
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=1.060 and later
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=1.060 and later
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=1.060 and later
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=1.060 and later
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=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MR/DSversion=1.060 and later
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=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MR/ESversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/ESversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DSSversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MR/ESversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MT/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/ESSversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-32MT/ESversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-40MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MR/DSversion=1.060 and later
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=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MR/DS-TSversion=1.060 and later
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=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MT/DSversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-64MT/DSSversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-24MT/DSSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DS-TSversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5S-80MT/ESSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-80MR/DSversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-40MR/ES-Aversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-96MT/Dversion=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5U-64MT/ESversion=1.060 and later
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=1.060 and later
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UJ-60MR/DSversion=All versions
Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5UC-32MT/DSS-TSversion=1.060 and later
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

5.3Mitsubishi Electric CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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-130Improper Handling of Length Parameter Inconsistency
CAPEC-47Buffer Overflow via Parameter Expansion
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

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Your stack

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