CVE-2021-4161
CVE-2021-4161 is a critical-severity vulnerability in Moxa Mgate Mb3180 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-319.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (47th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-319
- Affected product: Moxa Mgate Mb3180 Firmware
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-4161?
- 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.
- How severe is CVE-2021-4161?
- CVE-2021-4161 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-4161 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-4161?
- CVE-2021-4161 primarily affects Moxa Mgate Mb3180 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-4161?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2021-4161 published?
- CVE-2021-4161 was published on 2021-12-27 and last updated on 2026-06-17.
References
Affected products (3)
- cpe:2.3:o:moxa:mgate_mb3180_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:moxa:mgate_mb3280_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:moxa:mgate_mb3480_firmware:*:*:*:*:*:*:*:*
More vulnerabilities in Moxa Mgate Mb3180 Firmware
- CVE-2016-5804 — Critical (CVSS 9.8): Moxa MGate MB3180 before 1.8, MGate MB3280 before 2.7, MGate MB3480 before 2.6, MGate MB3170 before 2.5, and MGate…
- CVE-2021-33824 — High (CVSS 7.5): An issue was discovered on MOXA Mgate MB3180 Version 2.1 Build 18113012. Attackers can use slowhttptest tool to send…
- CVE-2021-33823 — High (CVSS 7.5): An issue was discovered on MOXA Mgate MB3180 Version 2.1 Build 18113012. Attacker could send a huge amount of TCP SYN…
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