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CVE-2025-5241: Denial-of-Service Vulnerability in MELSEC iQ-F Series

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-11 · updated 2026-06-17
• Weakness: CWE-645

Description

Overly Restrictive Account Lockout Mechanism vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series allows a remote unauthenticated attacker to lockout legitimate users for a certain period by repeatedly attempting to login with incorrect passwords. The legitimate users will be unable to login until a certain period has passed after the lockout or until the product is reset.

Affected products

• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-CCLGN-MS: all versions
• 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/ES: 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
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/DS: all versions
• Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/ES: all versions

References

• https://www.cisa.gov/news-events/ics-advisories/icsa-25-184-04
• https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-005_en.pdf

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