Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series Ethernet module

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Summary

CVECVE-2026-1876
StatePUBLISHED
AssignerMitsubishi
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-03 08:16:08 UTC
Updated2026-04-30 20:40:14 UTC
DescriptionImproper Resource Shutdown or Release vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP all versions allows a remote attacker to cause a denial-of-service (DoS) condition on the products by continuously sending UDP packets to the products. A system reset of the product is required for recovery.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.002000000 probability, percentile 0.418800000 (date 2026-04-30)

Problem Types: CWE-404 | CWE-404 CWE-404 Improper Resource Shutdown or Release

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Mitsubishielectric Melsec Iq-f Fx5-enet/ip - All All All
Operating System Mitsubishielectric Melsec Iq-f Fx5-enet/ip Firmware All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mitsubishi Electric Corporation MELSEC IQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP affected All versions Not specified

References

ReferenceSourceLinkTags
www.cisa.gov/news-events/ics-advisories/icsa-26-62-01 [email protected] www.cisa.gov Third Party Advisory
jvn.jp/vu/JVNVU93286687 [email protected] jvn.jp Third Party Advisory
www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf [email protected] www.mitsubishielectric.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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