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Vulnerability Assessment

Weakness
CWE
CWE-294
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Replay attack prevention
Impact

CVSS score of 8.1 (HIGH). Attack characteristics: network attack vector, high 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 high-severity affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 2.1% exploitation probability (EPSS)

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AnalysisAI

Authentication Bypass by Capture-replay vulnerability in Mitsubishi Electric MELSEC iQ-F series FX5U(C) CPU all versions, Mitsubishi Electric MELSEC iQ-F series FX5UJ CPU all versions, Mitsubishi. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required. 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-294. Authentication Bypass by Capture-replay vulnerability in Mitsubishi Electric MELSEC iQ-F series FX5U(C) CPU all versions, Mitsubishi Electric MELSEC iQ-F series FX5UJ CPU all versions, Mitsubishi Electric MELSEC iQ-R series R00/01/02CPU all versions, Mitsubishi Electric MELSEC iQ-R series R04/08/16/32/120(EN)CPU all versions, Mitsubishi Electric MELSEC iQ-R series R08/16/32/120SFCPU all versions, Mitsubishi Electric MELSEC iQ-R series R08/16/32/120PCPU all versions, Mitsubishi Electric MELSEC iQ-R series R08/16/32/120PSFCPU all versions, Mitsubishi Electric MELSEC iQ-R series R16/32/64MTCPU all versions, Mitsubishi Electric MELSEC iQ-R series RJ71C24(-R2/R4) all versions, Mitsubishi Electric MELSEC iQ-R series RJ71EN71 all versions, Mitsubishi Electric MELSEC iQ-R series RJ72GF15-T2 all versions, Mitsubishi Electric MELSEC Q series Q03/04/06/13/26UDVCPU all versions, Mitsubishi Electric MELSEC Q series Q04/06/13/26UDPVCPU all versions, Mitsubishi Electric MELSEC Q series QJ71C24N(-R2/R4) all versions and Mitsubishi Electric MELSEC Q series QJ71E71-100 all versions allows a remote unauthenticated attacker to login to the product by replay attack. Affected products include: Mitsubishielectric Fx5Uc Firmware, Mitsubishielectric Fx5Uc-32Mr\/Ds-Ts Firmware, Mitsubishielectric Fx5Uc-32Mt\/D Firmware, Mitsubishielectric Fx5Uc-32Mt\/Dss Firmware, Mitsubishielectric Fx5Uj-24Mr\/Es Firmware.

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Severity by source

NVD PRIMARY 8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

DescriptionNVD

Authentication Bypass by Capture-replay vulnerability in Mitsubishi Electric MELSEC iQ-F series FX5U(C) CPU all versions, Mitsubishi Electric MELSEC iQ-F series FX5UJ CPU all versions, Mitsubishi Electric MELSEC iQ-R series R00/01/02CPU all versions, Mitsubishi Electric MELSEC iQ-R series R04/08/16/32/120(EN)CPU all versions, Mitsubishi Electric MELSEC iQ-R series R08/16/32/120SFCPU all versions, Mitsubishi Electric MELSEC iQ-R series R08/16/32/120PCPU all versions, Mitsubishi Electric MELSEC iQ-R series R08/16/32/120PSFCPU all versions, Mitsubishi Electric MELSEC iQ-R series R16/32/64MTCPU all versions, Mitsubishi Electric MELSEC iQ-R series RJ71C24(-R2/R4) all versions, Mitsubishi Electric MELSEC iQ-R series RJ71EN71 all versions, Mitsubishi Electric MELSEC iQ-R series RJ72GF15-T2 all versions, Mitsubishi Electric MELSEC Q series Q03/04/06/13/26UDVCPU all versions, Mitsubishi Electric MELSEC Q series Q04/06/13/26UDPVCPU all versions, Mitsubishi Electric MELSEC Q series QJ71C24N(-R2/R4) all versions and Mitsubishi Electric MELSEC Q series QJ71E71-100 all versions allows a remote unauthenticated attacker to login to the product by replay attack.

Threat Intelligence Overview

EPSS Score
2.1%
Top 21% 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 HIGH
CISA KEV No
Public POC No
EPSS 2.1%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
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
No
Human Impact· derived
Medium

Priority Score

42
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +40
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:fx5uc_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uc-32mr\/ds-ts_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uc-32mt\/d_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uc-32mt\/dss_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj-24mr\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj-24mt\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj-24mt\/ess_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj-40mr\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj-40mt\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj-40mt\/ess_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj-60mr\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj-60mt\/es_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj-60mt\/ess_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uc-32mt\/dss-ts_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uc-32mt\/ds-ts_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mitsubishielectric:fx5uj_firmware:-:*:*:*:*:*:*:*

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Same weakness CWE-294 – Authentication Bypass by Capture-replay

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CVE-2017-3191 CRITICAL
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CVE-2023-1537 CRITICAL POC
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CVE-2022-29334 CRITICAL POC
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CVE-2021-27289 CRITICAL POC
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CVE-2022-31277 HIGH POC
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Same technique Authentication Bypass

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CVE-2015-3306 CRITICAL POC
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CVE-2023-22515 CRITICAL POC
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CVE-2012-4681 CRITICAL POC
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CVE-2013-2465 CRITICAL POC
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CVE-2011-3544 CRITICAL POC
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CVE-2022-40684 CRITICAL POC
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CVE-2025-61882 CRITICAL POC
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CVE-2024-0012 CRITICAL POC
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References

Advisories & patches
ADVISORY https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-031_en.pdf REF https://jvn.jp/vu/JVNVU96577897/index.html REF https://www.cisa.gov/uscert/ics/advisories/icsa-22-090-04

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