CVE-2026-111459— Unauthenticated server-supplied OpenVPN configuration in Moxa Remote Connect Suite (MRC Client)

Quick assessment

Affected

Moxa Moxa Remote Connect Suite (MRC Client)

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Moxa 远程连接套件（MRC Client）中存在一个证书验证不当的漏洞。在特定条件下，拥有通信路径访问权限的未认证攻击者可以伪装成受信任的服务器，对 MRC Client 与其服务器之间的通信发起中间人攻击，从而可能破坏通信的机密性和完整性。

CVSS 7.6 · High Updated Oct 27, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Unauthenticated server-supplied OpenVPN configuration in Moxa Remote Connect Suite (MRC Client)

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

证书验证不恰当

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Moxa	Moxa Remote Connect Suite (MRC Client)	1.0.0 ~ 4.2.0	-

II. Public POCs for CVE-2026-111459

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-111459

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Other References for CVE-2026-111459 (1)

https://www.moxa.com/en/support/product-support/security-advisory/mpsa-269510-cve-2026-111459-cve-2026-111460-cve-2026-111461-vulnerabilities-in-moxa-remote-connect-suite-mrc-client vendor-advisory

https://www.cve.org/CVERecord?id=CVE-2026-111459

Same Patch Batch · Moxa · 2026-10-27 · 3 CVEs total

CVE-2026-111460	7.7 HIGH	Static HTTPS private key and CA private key in firmware in OnCell G3150A-LTE Series
CVE-2026-111461	7.5 HIGH	SMS upgrade argument reaches system() unescaped in OnCell G3150A-LTE Series

IV. Related Vulnerabilities

Same vendor: Moxa

Same weakness: CWE-295