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Fx5Uc 32Mt D Firmware CVE-2023-4625

MEDIUM
Improper Restriction of Excessive Authentication Attempts (CWE-307)
2023-11-06 Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp
Authentication Bypass Fx5Uc 32Mt D Firmware Fx5Uc 32Mt Dss Firmware Fx5Uc 32Mt Ds Ts Firmware Fx5Uc 32Mt Dss Ts Firmware Fx5Uj 24Mr Es Firmware Fx5Uc 32Mr Ds Ts Firmware Fx5Uj 24Mt Es Firmware Fx5Uj 24Mt Ess Firmware Fx5Uj 40Mr Es Firmware Fx5Uj 40Mt Es Firmware Fx5Uj 40Mt Ess Firmware Fx5Uj 60Mr Es Firmware Fx5Uj 60Mt Es Firmware Fx5Uj 60Mt Ess Firmware Fx5U 80Mt Ess Firmware Fx5U 32Mt Dss Firmware Fx5U 64Mt Dss Firmware Fx5U 80Mt Dss Firmware Fx5Uc 64Mt D Firmware Fx5Uc 96Mt D Firmware Fx5Uc 64Mt Dss Firmware Fx5Uc 96Mt Dss Firmware Fx5Uj 24Mt Es A Firmware Fx5Uj 40Mt Es A Firmware Fx5Uj 60Mt Es A Firmware Fx5Uj 24Mr Es A Firmware Fx5Uj 40Mr Es A Firmware Fx5Uj 60Mr Es A Firmware Fx5S 30Mt Es Firmware Fx5S 40Mt Es Firmware Fx5S 60Mt Es Firmware Fx5S 80Mt Es Firmware Fx5S 30Mr Es Firmware Fx5S 40Mr Es Firmware Fx5S 60Mr Es Firmware Fx5S 80Mr Es Firmware Fx5S 30Mt Ess Firmware Fx5S 40Mt Ess Firmware Fx5S 60Mt Ess Firmware Fx5S 80Mt Ess Firmware Fx5U 32Mt Es Firmware Fx5U 64Mt Es Firmware Fx5U 80Mt Es Firmware Fx5U 32Mr Es Firmware Fx5U 64Mr Es Firmware Fx5U 80Mr Es Firmware Fx5U 32Mt Ds Firmware Fx5U 64Mt Ds Firmware Fx5U 80Mt Ds Firmware Fx5U 32Mr Ds Firmware Fx5U 64Mr Ds Firmware Fx5U 80Mr Ds Firmware Fx5U 32Mt Ess Firmware Fx5U 64Mt Ess Firmware Fx5Uj 24Mt Ds Firmware Fx5Uj 40Mt Ds Firmware Fx5Uj 60Mt Ds Firmware Fx5Uj 24Mr Ds Firmware Fx5Uj 40Mr Ds Firmware Fx5Uj 60Mr Ds Firmware Fx5Uj 24Mt Dss Firmware Fx5Uj 40Mt Dss Firmware Fx5Uj 60Mt Dss Firmware Mitsubishielectric
5.3
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-307
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Brute-force prevention, rate limiting
Impact

CVSS score of 5.3 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.9% exploitation probability (EPSS)

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AnalysisAI

Improper Restriction of Excessive Authentication Attempts vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F/iQ-R Series CPU modules Web server function allows a remote unauthenticated. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-307. Improper Restriction of Excessive Authentication Attempts vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F/iQ-R Series CPU modules Web server function allows a remote unauthenticated attacker to prevent legitimate users from logging into the Web server function for a certain period after the attacker has attempted to log in illegally by continuously attempting unauthorized login to the Web server function. The impact of this vulnerability will persist while the attacker continues to attempt unauthorized login. Affected products include: Mitsubishielectric Fx5U-32Mt\/Es Firmware, Mitsubishielectric Fx5U-64Mt\/Es Firmware, Mitsubishielectric Fx5U-80Mt\/Es Firmware, Mitsubishielectric Fx5U-32Mr\/Es Firmware, Mitsubishielectric Fx5U-64Mr\/Es Firmware.

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Severity by source

NVD PRIMARY 5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

DescriptionNVD

Improper Restriction of Excessive Authentication Attempts vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F/iQ-R Series CPU modules Web server function allows a remote unauthenticated attacker to prevent legitimate users from logging into the Web server function for a certain period after the attacker has attempted to log in illegally by continuously attempting unauthorized login to the Web server function. The impact of this vulnerability will persist while the attacker continues to attempt unauthorized login.

Threat Intelligence Overview

EPSS Score
0.9%
Top 43% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.9%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

27
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:o:mitsubishielectric:fx5u-32mt\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-64mt\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-80mt\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-32mr\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-64mr\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-80mr\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-32mt\/ds_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-64mt\/ds_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-80mt\/ds_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-32mr\/ds_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-64mr\/ds_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-80mr\/ds_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-32mt\/ess_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-64mt\/ess_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-80mt\/ess_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-32mt\/dss_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-64mt\/dss_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5u-80mt\/dss_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uc-32mt\/d_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uc-64mt\/d_firmware:-:*:*:*:*:*:*:*
+ 43 more

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Same weakness CWE-307 – Improper Restriction of Excessive Authentication Attempts

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References

Advisories & patches
ADVISORY https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-014_en.pdf REF https://jvn.jp/vu/JVNVU94620134 REF https://www.cisa.gov/news-events/ics-advisories/icsa-23-306-02

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