Vulnerability · Published Mar 3, 2026 · Assigned by Mitsubishi
CVE-2026-1876Denial-of-Service (DoS) vulnerability in Ethernet function of MELSEC iQ-F Series Ethernet module
High 8.7
In plain English
A high-severity security flaw in MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP from Mitsubishi Electric Corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mitsubishi Electric Corporation | MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP | All versions |
Weakness: CWE-404 · 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
References
- https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdf vendor-advisory
- https://jvn.jp/vu/JVNVU93286687/ government-resource
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-62-01 government-resource