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Fencer Vulns
critical 9.8

CVE-2021-4161 json

ICSA-21-357-01 Moxa MGate Protocol Gateways

published 2021-12-27 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-34029

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

The affected products contain vulnerable firmware, which could allow an attacker to sniff the traffic and decrypt login credential details. This could give an attacker admin rights through the HTTP web server.

Patch / fix

  • Moxa MGate MB3180 Series 2.2

Vendor advisories

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

cisa ICSA-21-357-01 updated cvss 9.8

Moxa MGate Protocol Gateways

  • Moxa MGate MB3180 Series <= 2.2 Moxa MGate MB3280 Series <= 4.1 Moxa MGate MB3480 Series <= 3.2
    affected: mitigation “Enable 'HTTPS' and disable the HTTP console function under 'Console Settings'” cdn-cms.azureedge.net

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

0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Moxa MGate MB3180 Series
  • Moxa MGate MB3280 Series
  • Moxa MGate MB3480 Series

Classification

Weakness
  • CWE-319 Cleartext Transmission of Sensitive Information

References

Sources

Fencer Vulns 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.