Overly restrictive account lockout mechanism in Mitsubishi Electric MELSEC iQ-F Series



Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2025-5241
CWE-ID CWE-645
Exploitation vector Network
Public exploit N/A
Vulnerable software
MELSEC iQ-F FX5U-32MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-32MT/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-32MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-32MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-32MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-32MR/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-64MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-64MT/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-64MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-64MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-64MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-64MR/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-80MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-80MT/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-80MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-80MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-80MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5U-80MR/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UC-32MT/D
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UC-32MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UC-64MT/D
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UC-64MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UC-96MT/D
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UC-96MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UC-32MT/DS-TS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UC-32MT/DSS-TS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UC-32MR/DS-TS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-24MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-24MT/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-24MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-24MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-24MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-24MR/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-40MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-40MT/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-40MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-40MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-40MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-40MR/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-60MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-60MT/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-60MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-60MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-60MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-60MR/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-24MT/ES-A
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-24MR/ES-A
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-40MT/ES-A
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-40MR/ES-A
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-60MT/ES-A
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5UJ-60MR/ES-A
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-30MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-30MT/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-30MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-30MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-30MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-30MR/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-40MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-40MT/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-40MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-40MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-40MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-40MR/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-60MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-60MT/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-60MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-60MT/DSS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-60MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-60MR/DS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-80MT/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-80MT/ESS
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5S-80MR/ES
Hardware solutions / Routers & switches, VoIP, GSM, etc

MELSEC iQ-F FX5-CCLGN-MS
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor Mitsubishi Electric

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Overly restrictive account lockout mechanism

EUVDB-ID: #VU112177

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-5241

CWE-ID: CWE-645 - Overly Restrictive Account Lockout Mechanism

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to an overly restrictive account lockout mechanism. A remote attacker can lock out a legitimate user by continually attempting to login with an incorrect password.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

MELSEC iQ-F FX5U-32MT/ES: All versions

MELSEC iQ-F FX5U-32MT/DS: All versions

MELSEC iQ-F FX5U-32MT/ESS: All versions

MELSEC iQ-F FX5U-32MT/DSS: All versions

MELSEC iQ-F FX5U-32MR/ES: All versions

MELSEC iQ-F FX5U-32MR/DS: All versions

MELSEC iQ-F FX5U-64MT/ES: All versions

MELSEC iQ-F FX5U-64MT/DS: All versions

MELSEC iQ-F FX5U-64MT/ESS: All versions

MELSEC iQ-F FX5U-64MT/DSS: All versions

MELSEC iQ-F FX5U-64MR/ES: All versions

MELSEC iQ-F FX5U-64MR/DS: All versions

MELSEC iQ-F FX5U-80MT/ES: All versions

MELSEC iQ-F FX5U-80MT/DS: All versions

MELSEC iQ-F FX5U-80MT/ESS: All versions

MELSEC iQ-F FX5U-80MT/DSS: All versions

MELSEC iQ-F FX5U-80MR/ES: All versions

MELSEC iQ-F FX5U-80MR/DS: All versions

MELSEC iQ-F FX5UC-32MT/D: All versions

MELSEC iQ-F FX5UC-32MT/DSS: All versions

MELSEC iQ-F FX5UC-64MT/D: All versions

MELSEC iQ-F FX5UC-64MT/DSS: All versions

MELSEC iQ-F FX5UC-96MT/D: All versions

MELSEC iQ-F FX5UC-96MT/DSS: All versions

MELSEC iQ-F FX5UC-32MT/DS-TS: All versions

MELSEC iQ-F FX5UC-32MT/DSS-TS: All versions

MELSEC iQ-F FX5UC-32MR/DS-TS: All versions

MELSEC iQ-F FX5UJ-24MT/ES: All versions

MELSEC iQ-F FX5UJ-24MT/DS: All versions

MELSEC iQ-F FX5UJ-24MT/ESS: All versions

MELSEC iQ-F FX5UJ-24MT/DSS: All versions

MELSEC iQ-F FX5UJ-24MR/ES: All versions

MELSEC iQ-F FX5UJ-24MR/DS: All versions

MELSEC iQ-F FX5UJ-40MT/ES: All versions

MELSEC iQ-F FX5UJ-40MT/DS: All versions

MELSEC iQ-F FX5UJ-40MT/ESS: All versions

MELSEC iQ-F FX5UJ-40MT/DSS: All versions

MELSEC iQ-F FX5UJ-40MR/ES: All versions

MELSEC iQ-F FX5UJ-40MR/DS: All versions

MELSEC iQ-F FX5UJ-60MT/ES: All versions

MELSEC iQ-F FX5UJ-60MT/DS: All versions

MELSEC iQ-F FX5UJ-60MT/ESS: All versions

MELSEC iQ-F FX5UJ-60MT/DSS: All versions

MELSEC iQ-F FX5UJ-60MR/ES: All versions

MELSEC iQ-F FX5UJ-60MR/DS: All versions

MELSEC iQ-F FX5UJ-24MT/ES-A: All versions

MELSEC iQ-F FX5UJ-24MR/ES-A: All versions

MELSEC iQ-F FX5UJ-40MT/ES-A: All versions

MELSEC iQ-F FX5UJ-40MR/ES-A: All versions

MELSEC iQ-F FX5UJ-60MT/ES-A: All versions

MELSEC iQ-F FX5UJ-60MR/ES-A: All versions

MELSEC iQ-F FX5S-30MT/ES: All versions

MELSEC iQ-F FX5S-30MT/DS: All versions

MELSEC iQ-F FX5S-30MT/ESS: All versions

MELSEC iQ-F FX5S-30MT/DSS: All versions

MELSEC iQ-F FX5S-30MR/ES: All versions

MELSEC iQ-F FX5S-30MR/DS: All versions

MELSEC iQ-F FX5S-40MT/ES: All versions

MELSEC iQ-F FX5S-40MT/DS: All versions

MELSEC iQ-F FX5S-40MT/ESS: All versions

MELSEC iQ-F FX5S-40MT/DSS: All versions

MELSEC iQ-F FX5S-40MR/ES: All versions

MELSEC iQ-F FX5S-40MR/DS: All versions

MELSEC iQ-F FX5S-60MT/ES: All versions

MELSEC iQ-F FX5S-60MT/DS: All versions

MELSEC iQ-F FX5S-60MT/ESS: All versions

MELSEC iQ-F FX5S-60MT/DSS: All versions

MELSEC iQ-F FX5S-60MR/ES: All versions

MELSEC iQ-F FX5S-60MR/DS: All versions

MELSEC iQ-F FX5S-80MT/ES: All versions

MELSEC iQ-F FX5S-80MT/ESS: All versions

MELSEC iQ-F FX5S-80MR/ES: All versions

MELSEC iQ-F FX5-CCLGN-MS: All versions

CPE2.3 External links

https://www.cisa.gov/news-events/ics-advisories/icsa-25-184-04


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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