What’s Vulnerable › Vulnerabilities

CVE-2025-5514: Denial-of-Service(DoS) Vulnerability in Web server function on MELSEC iQ-F Series CPU module

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-25 · updated 2026-06-17
• Weakness: CWE-130

Description

Improper Handling of Length Parameter Inconsistency vulnerability in web server function on Mitsubishi Electric Corporation MELSEC iQ-F Series CPU module allows a remote unauthenticated attacker to delay the processing of the web server function and prevent legitimate users from utilizing the web server function, by sending a specially crafted HTTP request.

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: 1.060 and later
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MR/ES: 1.060 and later
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DS: 1.060 and later
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/DSS: 1.060 and later
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ES: 1.060 and later
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-32MT/ESS: 1.060 and later

References

• https://jvn.jp/vu/JVNVU90316328/
• https://www.cisa.gov/news-events/ics-advisories/icsa-25-233-01
• https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-010_en.pdf

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