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TI-2026-81030 Aliases CVE-2026-111459GHSA-vrmg-3792-4rx3

Improper certificate validation in Moxa MRC Client

Priority LOW 34CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Spoofing
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-295.

Summary

Moxa Remote Connect Suite (MRC Client) versions 1.0.0 through 4.2.0 do not properly validate certificates (CWE-295). Under certain conditions, an unauthenticated attacker with on-path access to traffic between the client and its server can impersonate the trusted server and perform a man-in-the-middle attack. This can compromise the confidentiality and integrity of communications.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

An improper certificate validation vulnerability exists in Moxa Remote Connect Suite (MRC Client). Under certain conditions, an unauthenticated attacker with on-path access to the communication between the MRC Client and its server could impersonate a trusted server and conduct a man-in-the-middle attack, potentially compromising the confidentiality and integrity of communications.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00173 6th percentileScored 2026-11-07
Fix Fixed Moxa Remote Connect Suite (MRC Client) (Moxa): 4.2.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MoxaMoxa Remote Connect Suite (MRC Client)1.0.0 – 4.2.04.2.2Patch availableCNA
  • Moxa Remote Connect Suite (MRC Client) VendorMoxa Affected 1.0.0 – 4.2.0 Fixed in 4.2.2 Patch available CNA

Remediation

Upgrade Moxa Remote Connect Suite (MRC Client) to version 4.2.2.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA Moxa Remote Connect Suite (MRC Client) (Moxa) Fixed in 4.2.2

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-111459
  2. 2026-10-27 Alias added: GHSA-vrmg-3792-4rx3
  3. 2026-10-27 Priority changed: MEDIUM → LOW
  4. 2026-11-04 CISA SSVC decision points changed

References

Advisory 1

  • TI-2021-17455 Hard-coded credentials in Moxa MXView Series CVSS 3.1CRITICAL 9.8
  • TI-2010-04465 Stack-based buffer overflow in a certain ActiveX control in MediaDBPlayback.DLL 2.2.0.5… CVSS 2.0HIGH 10.0
  • TI-2022-19087 A denial of service vulnerability exists in the web server functionality of Moxa SDS-3008… CVSS 3.1HIGH 7.5
  • TI-2016-07634 Missing brute-force protection in Moxa NPort CVSS 3.1CRITICAL 9.8
  • TI-2021-17457 Cleartext transmission of sensitive information in Moxa MXView Series CVSS 3.1HIGH 7.5
  • TI-2022-19326 Information disclosure in Moxa SDS-3008 Series Industrial Ethernet Switch CVSS 3.1MEDIUM 5.3
See all 328 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences