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Fencer Intel
medium 5.3

CVE-2025-5241 json

Denial-of-Service Vulnerability in MELSEC iQ-F Series

published last yr. modified 4mo ago also EUVD-2025-21089

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

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.

Is CVE-2025-5241 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-25-184-04 updated cvss 5.3

Mitsubishi Electric MELSEC iQ-F Series

  • Mitsubishi Electric Corporation FX5-CCLGN-MS Mitsubishi Electric Corporation FX5S-30MR/DS Mitsubishi Electric Corporation FX5S-30MR/ES Mitsubishi Electric Corporation FX5S-30MT/DS Mitsubishi Electric Corporation FX5S-30MT/DSS Mitsubishi Electric Corporation FX5S-30MT/ES
    +34 more products
    Mitsubishi Electric Corporation FX5S-30MT/ESS Mitsubishi Electric Corporation FX5S-40MR/DS Mitsubishi Electric Corporation FX5S-40MR/ES Mitsubishi Electric Corporation FX5S-40MT/DS Mitsubishi Electric Corporation FX5S-40MT/DSS Mitsubishi Electric Corporation FX5S-40MT/ES Mitsubishi Electric Corporation FX5S-40MT/ESS Mitsubishi Electric Corporation FX5S-60MR/DS Mitsubishi Electric Corporation FX5S-60MR/ES Mitsubishi Electric Corporation FX5S-60MT/DS Mitsubishi Electric Corporation FX5S-60MT/DSS Mitsubishi Electric Corporation FX5S-60MT/ES Mitsubishi Electric Corporation FX5S-60MT/ESS Mitsubishi Electric Corporation FX5S-80MR/ES Mitsubishi Electric Corporation FX5S-80MT/ES Mitsubishi Electric Corporation FX5S-80MT/ESS Mitsubishi Electric Corporation FX5U-32MR/DS Mitsubishi Electric Corporation FX5U-32MR/ES Mitsubishi Electric Corporation FX5U-32MT/DS Mitsubishi Electric Corporation FX5U-32MT/DSS Mitsubishi Electric Corporation FX5U-32MT/ES Mitsubishi Electric Corporation FX5U-32MT/ESS Mitsubishi Electric Corporation FX5U-64MR/DS Mitsubishi Electric Corporation FX5U-64MR/ES Mitsubishi Electric Corporation FX5U-64MT/DS Mitsubishi Electric Corporation FX5U-64MT/DSS Mitsubishi Electric Corporation FX5U-64MT/ES Mitsubishi Electric Corporation FX5U-64MT/ESS Mitsubishi Electric Corporation FX5U-80MR/DS Mitsubishi Electric Corporation FX5U-80MR/ES Mitsubishi Electric Corporation FX5U-80MT/DS Mitsubishi Electric Corporation FX5U-80MT/DSS Mitsubishi Electric Corporation FX5U-80MT/ES Mitsubishi Electric Corporation FX5U-80MT/ESS
    affected: mitigation “Use a firewall or virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.” mitsubishielectric.com

33 more affected in the full advisory

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-64MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5U-80MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/D
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/D
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-64MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/D
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-96MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DS-TS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MT/DSS-TS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UC-32MR/DS-TS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ESS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/DSS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MR/ES
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MR/DS
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MT/ES-A
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-24MR/ES-A
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MT/ES-A
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-40MR/ES-A
  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5UJ-60MT/ES-A

Classification

Weakness
  • CWE-645 Overly Restrictive Account Lockout Mechanism

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.