CVE-2015-3938

highpriority · track · 32EPSS 0.022 · 83 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

2.23% (83rd) EPSS

CVSS 7.8 · high

Is it mine?

4 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

The HTTP application on Mitsubishi Electric MELSEC FX3G PLC devices before April 2015 allows remote attackers to cause a denial of service (device outage) via a long parameter.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

MitigationMELSEC FX3G Series PLCscisa_csaf_ot
Mitsubishi Electric enhanced the MELSEC FX PLCs to prevent the DoS from occurring in new products starting in April 2015. They cannot guarantee the quality of new firmware in old hardware, so they do not plan to issue a firmware upgrade to existing customers.

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–7.8

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v2.07.1highAV:N/AC:M/Au:N/C:N/I:N/A:Csecondary · CISA US

v2.06.6mediumAV:N/AC:L/Au:N/C:N/I:N/A:C/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-399USprimaryCWE-233US

affected products (4)

Products and version ranges known to be affected.

Mitsubishi Electric MELSEC FX3G Series PLCs: vers:all/*all versionscisa_csaf_otUS
Mitsubishi Electric MELSEC FX3G Series PLCs≤ vers:all/*cisa_csaf_otUS
n/a n/a≤ n/aenisa_euvdEU
mitsubishi electric melsec fx3gall versionsnvdUScpe:2.3:h:mitsubishi_electric:melsec_fx3g:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-15-146-01Mitsubishi Electric MELSEC FX-Series Controllers Denial of Service2015-02-26icsa · cisa_csaf_otUS
This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2015-10-06modified 2026-06-17

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+3721 more

references (3)

External citations — patches, advisories, analysis.

https://ics-cert.us-cert.gov/advisories/ICSA-15-146-01 cnnvd
https://ics-cert.us-cert.gov/advisories/ICSA-15-146-01 enisa_euvd
https://ics-cert.us-cert.gov/advisories/ICSA-15-146-01Third Party AdvisoryUS Government Resourcenvd

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