HOMEVULNERABILITIESCVE-2021-46082
HIGH

CVE-2021-46082

CWE-401Published: February 18, 2022· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-46082 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

moxa12 product(s)
tn-5916-wv-t firmwaretn-5916-wv-ttn-5916-wv-ct-t firmwaretn-5916-wv-ct-tmgate 5109 firmwaremgate 5109mgate 5109-t firmwaremgate 5109-tmgate 5101-pbm-mn firmwaremgate 5101-pbm-mnmgate 5101-pbm-mn-t firmwaremgate 5101-pbm-mn-t
Source: NVD CPE · 12 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.moxa.com/en/support/product-support/security-advisory/mgate-5109-5101-protocol-gateways-vulnerability
PATCHhttps://www.moxa.com/en/support/product-support/security-advisory/mgate-5109-5101-protocol-gateways-vulnerability
ADVISORYhttps://www.moxa.com/en/support/product-support/security-advisory/tn-5900-secure-routers-vulnerability
ADVISORYhttps://www.moxa.com/en/support/product-support/security-advisory/tn-5900-secure-routers-vulnerability

All References (4)

→
https://www.moxa.com/en/support/product-support/security-advisory/mgate-5109-5101-protocol-gateways-vulnerabilityPatch · Vendor Advisory
→
https://www.moxa.com/en/support/product-support/security-advisory/tn-5900-secure-routers-vulnerabilityVendor Advisory
→
https://www.moxa.com/en/support/product-support/security-advisory/mgate-5109-5101-protocol-gateways-vulnerabilityPatch · Vendor Advisory
→
https://www.moxa.com/en/support/product-support/security-advisory/tn-5900-secure-routers-vulnerabilityVendor Advisory

Quick Facts

CVE IDCVE-2021-46082
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-401
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 18, 2022

Related CVEs (CWE-401)

CVE-2019-17340
8.8
CVE-2019-6128
8.8
CVE-2021-40633
8.8
CVE-2023-33718
8.8
CVE-2026-0646
8.7
CVE-2021-1353
8.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-46082 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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