# CVE-2026-1875 — Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP

> As of 2026-04-24, CVE-2026-1875 is a HIGH-severity vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP, CVSS v3.1 7.5, EPSS 0.4% (35.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-1875, most recently “Mitsubishi Electric MELSEC iQ-F FX5-ENET/IP and FX5-EIP remote unauthenticated denial-of-service via UDP flood (CVE-2026-1874, CVE-2026-1875, CVE-2026-1876)”.

**Last updated:** 2026-04-24

## What is CVE-2026-1875?

Improper Resource Shutdown or Release vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP versions 1.000 and prior 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.

The record classifies CVE-2026-1875 under weakness class [CWE-404](https://cwe.mitre.org/data/definitions/404.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 221 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **CVSS v4.0 base score:** 8.7 (`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`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 35.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-03-03, last modified 2026-04-24

## Is CVE-2026-1875 being exploited?

It currently carries a trending score of 14 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Mitsubishi Electric Corporation](https://intel.threadlinqs.com/vendors/mitsubishi-electric): MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP

## How to fix CVE-2026-1875

Vendor advisory: [https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf](https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2026-1875

1 tracked threat in the Threadlinqs corpus references CVE-2026-1875, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Mitsubishi Electric MELSEC iQ-F FX5-ENET/IP and FX5-EIP remote unauthenticated denial-of-service via UDP flood (CVE-2026-1874, CVE-2026-1875, CVE-2026-1876)](https://intel.threadlinqs.com/threat/TL-2026-1874) — HIGH · 2026-08-04

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [mitsubishielectric.com — vendor advisory](https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf)

**Third-party advisory**

- [jvn.jp — government resource](https://jvn.jp/vu/JVNVU93286687/)
- [cisa.gov — government resource](https://www.cisa.gov/news-events/ics-advisories/icsa-26-62-01)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-1875
Full detection coverage and IOCs for threats exploiting CVE-2026-1875 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp