Moxa TN-5900 v3.1 series routers, MGate 5109 v2.2 series protocol gateways, and MGate 5101-PBM-MN v2.1 series protocol gateways were discov…

published 2022-02-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32784

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

Moxa TN-5900 v3.1 series routers, MGate 5109 v2.2 series protocol gateways, and MGate 5101-PBM-MN v2.1 series protocol gateways were discovered to contain a memory leak which allows attackers to cause a Denial of Service (DoS) via crafted packets.

Patch / fix

links 1

moxa.com/en/support/product-support/security-advisory/mgate-5109-51… advisory

Exploit prediction

1.18% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness

CWE-401 Missing Release of Memory after Effective Lifetime

References

moxa.com /en/support/product-support/security-advisory/mgate-5109-5101-protocol-gateways-vulnerability
patch, vendor-advisory
moxa.com /en/support/product-support/security-advisory/tn-5900-secure-routers-vulnerability
vendor-advisory

Sources

CVE List CVE-2021-46082
NVD CVE-2021-46082

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.

Summary