Back
CVE-2021-4161
ICSA-21-357-01 Moxa MGate Protocol Gateways
Critical9.8EPSS 0.70%
- Published
- Updated
- Reserved
- Assigned by
- icscert
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| icscertCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.70% · top 47% of all CVEs (6 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
Affected products
- affected all – < 2.2
- affected all 4.1
- affected all 3.2
What to do
Solution: Moxa has developed the following mitigations to address this vulnerability. Enable ‘HTTPS’ and disable the HTTP console function under ‘Console Settings’ Moxa also recommends users refer to Tech Note: Moxa Security Hardening Guide for MGate MB3000 Series
References (1)
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-357-01 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-4161)Record last updated .