How severe is CVE-2026-1874?

CVE-2026-1874 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-1874 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-1874?

CVE-2026-1874 primarily affects Mitsubishielectric Melsec Iq-f Fx5-eip Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-1874?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-1874 have an EU (EUVD) identifier?

Yes. CVE-2026-1874 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9280.

When was CVE-2026-1874 published?

CVE-2026-1874 was published on 2026-03-03 and last updated on 2026-06-17.

CVE-2026-1874

CVE-2026-1874 is a high-severity vulnerability in Mitsubishielectric Melsec Iq-f Fx5-eip Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-670.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9280
Weakness: CWE-670
Affected product: Mitsubishielectric Melsec Iq-f Fx5-eip Firmware
Published: 2026-03-03
Last modified: 2026-06-17

Description

Always-Incorrect Control Flow Implementation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP versions 1.106 and prior and 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.

Frequently asked questions

What is CVE-2026-1874?: Always-Incorrect Control Flow Implementation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP versions 1.106 and prior and 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.
How severe is CVE-2026-1874?: CVE-2026-1874 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-1874 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-1874?: CVE-2026-1874 primarily affects Mitsubishielectric Melsec Iq-f Fx5-eip Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-1874?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-1874 have an EU (EUVD) identifier?: Yes. CVE-2026-1874 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9280.
When was CVE-2026-1874 published?: CVE-2026-1874 was published on 2026-03-03 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:mitsubishielectric:melsec_iq-f_fx5-eip_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:melsec_iq-f_fx5-enet\/ip_firmware:*:*:*:*:*:*:*:*

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