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Mitsubishi Electric MELSEC iQ-F Series EtherNet/IP module and Ethernet module Always-Incorrect Control Flow Implementation (CVE-2026-1874)

high Tenable OT Security Plugin ID 505913

Synopsis

The remote OT asset is affected by a vulnerability.

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.

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Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

See Also

https://jvn.jp/vu/JVNVU93286687/

https://www.cisa.gov/news-events/ics-advisories/icsa-26-62-01

http://www.nessus.org/u?249bfcba

Plugin Details

Severity: High

ID: 505913

File Name: tenable_ot_mitsubishi_CVE-2026-1874.nasl

Version: 1.3

Type: Remote

Family: Tenable.ot

Published: 8/3/2026

Updated: 8/4/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-1874

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

Vector: 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

Vulnerability Information

CPE: cpe:/o:mitsubishielectric:melsec_iq-f_fx5-eip_firmware, cpe:/o:mitsubishielectric:melsec_iq-f_fx5-enet%2fip_firmware

Required KB Items: Tenable.ot/Mitsubishi

Exploit Ease: No known exploits are available

Patch Publication Date: 3/3/2026

Vulnerability Publication Date: 3/3/2026

Reference Information

CVE: CVE-2026-1874

CWE: 670