What’s Vulnerable › Vulnerabilities

CVE-2025-3755: Information Disclosure and Denial-of-Service(DoS) Vulnerability in MELSEC iQ-F Series CPU module

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-29 · updated 2026-06-17
• Weakness: CWE-1285

Description

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.

Affected products

• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/DSS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/ESS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MR/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MR/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/DSS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/ESS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MR/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MR/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/DSS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/ESS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MR/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MR/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MT/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MT/DSS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MT/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-80MT/ESS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DSS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ES: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ESS: all versions

References

• https://jvn.jp/vu/JVNVU94070048/
• https://www.cisa.gov/news-events/ics-advisories/icsa-25-153-03
• https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-003_en.pdf

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