How severe is CVE-2015-3938?

CVE-2015-3938 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2015-3938 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-3938?

CVE-2015-3938 affects Mitsubishi Electric Melsec Fx3g. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-3938?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2015-3938 published?

CVE-2015-3938 was published on 2015-10-06 and last updated on 2026-06-17.

CVE-2015-3938

CVE-2015-3938 is a high-severity vulnerability in Mitsubishi Electric Melsec Fx3g with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Mitsubishi Electric Melsec Fx3g
Published: 2015-10-06
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2015-3938?: 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.
How severe is CVE-2015-3938?: CVE-2015-3938 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2015-3938 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-3938?: CVE-2015-3938 affects Mitsubishi Electric Melsec Fx3g. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-3938?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2015-3938 published?: CVE-2015-3938 was published on 2015-10-06 and last updated on 2026-06-17.

References

https://ics-cert.us-cert.gov/advisories/ICSA-15-146-01

Affected products (1)

cpe:2.3:h:mitsubishi_electric:melsec_fx3g:-:*:*:*:*:*:*:*

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