PatchTheCVECVE-2015-3938: The HTTP application on Mitsubishi Electric MELSEC FX3G PLC devices before April 2015 allows remote attackers
CVE-2015-3938 is a high-severity flaw (CVSS 7.8) affecting melsec fx3g. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 7.8 (High) |
| EPSS exploit chance | 2.2% (top 17%) |
| CISA exploited list | No |
| Weakness | CWE-399 |
| Published | 2015-10-06 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2015-3938?
melsec fx3g: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2015-3938 being exploited?
CVE-2015-3938 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2015-3938 affect?
CVE-2015-3938 affects melsec fx3g. Severity is high (CVSS 7.8). 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 urgent is CVE-2015-3938?
Priority 48/100. High severity
Software pages
Mitsubishi Electric vulnerabilities