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CVE-2026-1876— Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series Ethernet module

Quick assessment

Affected
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mitsubishi Electric MELSEC iQ-F Series是日本三菱电机（Mitsubishi Electric）公司的一系列简易运动控制器。 Mitsubishi Electric MELSEC iQ-F Series存在安全漏洞，该漏洞源于FX5-ENET/IP以太网模块资源关闭或释放不当，可能导致远程攻击者通过持续发送UDP数据包造成拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-1876

Vulnerability Information
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Vulnerability Title
Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series Ethernet module
Source: CVE Program / CVE List V5
Vulnerability Description
Improper 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
Mitsubishi Electric MELSEC iQ-F Series 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mitsubishi Electric MELSEC iQ-F Series是日本三菱电机（Mitsubishi Electric）公司的一系列简易运动控制器。 Mitsubishi Electric MELSEC iQ-F Series存在安全漏洞，该漏洞源于FX5-ENET/IP以太网模块资源关闭或释放不当，可能导致远程攻击者通过持续发送UDP数据包造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP All versions -

II. Public POCs for CVE-2026-1876

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III. Intelligence Information for CVE-2026-1876

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Vendor Advisories for CVE-2026-1876 (2)

Same Patch Batch · Mitsubishi Electric Corporation · 2026-03-03 · 3 CVEs total

CVE-2026-1875 Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series EtherNet/
CVE-2026-1874 Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series EtherNet/

IV. Related Vulnerabilities

Same product: MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP
Same vendor: Mitsubishi Electric Corporation
Same weakness: CWE-404

V. Comments for CVE-2026-1876

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