CVE-2025-3755

Improper Validation of Specified Index, Position, or Offset in Input vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series CPU modules allows a remote unauthenticated attacker to read information in the product, to cause a Denial-of-Service (DoS) condition in MELSOFT connection, or to stop the operation of the CPU module (causing a DoS condtion on the CPU module), by sending specially crafted packets. The product is needed to reset for recovery.

Scoring

Severity

CRITICAL

CVSS base score

9.1

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS probability

0.83%

CWE

CWE-1285

Published

2025-05-29

Last modified

2026-03-12

Affected products

• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ES
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DS
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ESS
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DSS
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/ES
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/DS
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ES
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DS

Weakness type

• CWE-1285

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