An issue was discovered on Moxa MGate MB3170 and MB3270 devices before 4.1, MB3280 and MB3480 devices before 3.1, MB3660 devices before 2.3…

published 2020-03-11 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-18486

cvss: 8.8; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits: 0; none known

An issue was discovered on Moxa MGate MB3170 and MB3270 devices before 4.1, MB3280 and MB3480 devices before 3.1, MB3660 devices before 2.3, and MB3180 devices before 2.1. Sensitive information is sent to the web server in cleartext, which may allow an attacker to discover the credentials if they are able to observe traffic between the web browser and the server.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-056-01 updated 2020-02-25 cvss 7.5

Moxa MB3xxx Series Protocol Gateways

Moxa MB3170 series <= 4.0 Moxa MB3180 series <= 2.0 Moxa MB3270 series <= 4.0 Moxa MB3280 series <= 3.0 Moxa MB3480 series <= 3.0 Moxa MB3660 series <= 2.2
affected: mitigation “MB3170 Series: Download the new firmware.” moxa.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.97% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.0	8.8	CVSS:3.0/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:R
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

CWE-319 Cleartext Transmission of Sensitive Information

References

moxa.com /en/support/support/security-advisory/mb3710-3180-3270-3280-3480-3660-vulnerabilities
vendor-advisory
us-cert.gov /ics/advisories/icsa-20-056-01
third-party-advisory, us-government-resource

Sources

CVE List CVE-2019-9101
NVD CVE-2019-9101

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary