CVE-2026-1875Network attack vector

Service interruption via unreleased UDP receive buffers

Published Mar 3, 2026 · Updated Mar 3, 2026

Improper resource release in Mitsubishi Electric MELSEC iQ-F FX5-EIP firmware 1.000 and earlier allows remote attackers to interrupt service via UDP traffic. Continuous UDP packets exhaust the Ethernet function's receive buffer because resources are not released correctly. No authentication or user interaction is required, and recovery requires a system reset, leaving availability interrupted until an operator resets the module.

CVSS severity8.7
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper resource release in Mitsubishi Electric MELSEC iQ-F FX5-EIP firmware 1.000 and earlier allows remote attackers to interrupt service via UDP traffic. Continuous UDP packets exhaust the Ethernet function's receive buffer because resources are not released correctly. No authentication or user interaction is required, and recovery requires a system reset, leaving availability interrupted until an operator resets the module.

The record

CVE
CVE-2026-1875
Published
Mar 3, 2026
Updated
Mar 3, 2026
Vendor
Mitsubishi Electric Corporation
Product
MELSEC iQ-F Series FX5-EIP EtherNet/IP Module
Classifications
CWE-404, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mitsubishi Electric Corporation · MELSEC iQ-F Series FX5-EIP EtherNet/IP Moduleversion=All versions

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7Mitsubishi Electric CorporationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
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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