Is CVE-2016-5804 in the CISA KEV catalog?

No. CVE-2016-5804 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-5804?

CVE-2016-5804 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2016-5804?

CVE-2016-5804 has an EPSS score of 1.12% (62th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-5804?

Upgrade mgate mb3170 firmware to 2.5 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2016-5804

CRITICAL

9.8

CVSS v3

NVD

Description

Moxa MGate MB3180 before 1.8, MGate MB3280 before 2.7, MGate MB3480 before 2.6, MGate MB3170 before 2.5, and MGate MB3270 before 2.7 use weak encryption, which allows remote attackers to bypass authentication via a brute-force series of guesses for a parameter value.

CWE-326

How to fix

Remediation Available

mgate mb3170 firmwareNVD

Affected:< 2.5Fixed in:2.5CVE-2016-5804derived from NVD

mgate mb3180 firmwareNVD

Affected:< 1.8Fixed in:1.8CVE-2016-5804derived from NVD

mgate mb3270 firmwareNVD

Affected:< 2.7Fixed in:2.7CVE-2016-5804derived from NVD

mgate mb3280 firmwareNVD

Affected:< 2.7Fixed in:2.7CVE-2016-5804derived from NVD

mgate mb3480 firmwareNVD

Affected:< 2.6Fixed in:2.6CVE-2016-5804derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.12%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Third-Party Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.