CVE-2025-5191

Unquoted Search Path Vulnerability in the Utility for Industrial Computers (Windows)

Published Aug 25, 2025 CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed

Description

An Unquoted Search Path vulnerability has been identified in the utility for Moxa’s industrial computers (Windows). Due to the unquoted path configuration in the SerialInterfaceService.exe utility, a local attacker with limited privileges could place a malicious executable in a higher-priority directory within the search path. When the Serial Interface service starts, the malicious executable could be run with SYSTEM privileges. Successful exploitation could allow privilege escalation or enable an attacker to maintain persistence on the affected system. While successful exploitation can severely impact the confidentiality, integrity, and availability of the affected device itself, there is no loss of confidentiality, integrity, or availability within any subsequent systems.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Moxa

Utility for DRP-A100 Series

unaffected

Version	Status	Constraints
`1.0`	affected	≤ 1.1
`1.2`	unaffected	—

Moxa

Utility for DRP-A100 Series

unaffected

Version	Status	Constraints
`1.0`	affected	—
`1.1`	unaffected	—

Moxa

Utility for DRP-C100 Series

unaffected

Version	Status	Constraints
`1.0`	affected	≤ 1.1
`1.2`	unaffected	—

Moxa

Utility for DRP-C100 Series

unaffected

Version	Status	Constraints
`1.0`	affected	—
`1.1`	unaffected	—

No data.

Vendor	Product	Versions
Microsoft	Windows	—
Moxa	Drp-a100	—
Moxa	Drp-c100	—
Moxa	Serial Interface Service	—
Moxa	Utility For Moxa Industrial Computers	—

Remediation

Vendor Solution

Moxa has developed appropriate solutions to address this vulnerability. The solutions for the affected products are listed in the security advisory: https://www.moxa.com/en/support/product-support/security-advisory/mpsa-256421-cve-2025-5191-unquoted-search-path-vulnerability-in-the-utility-for-industrial-computers-(windows)

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2025-25691	An Unquoted Search Path vulnerability has been identified in the utility for Moxa’s industrial computers (Windows). Due to the unquoted path configuration in the SerialInterfaceService.exe utility, a local attacker with limited privileges could place a malicious executable in a higher-priority directory within the search path. When the Serial Interface service starts, the malicious executable could be run with SYSTEM privileges. Successful exploitation could allow privilege escalation or enable an attacker to maintain persistence on the affected system. While successful exploitation can severely impact the confidentiality, integrity, and availability of the affected device itself, there is no loss of confidentiality, integrity, or availability within any subsequent systems.

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.150% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://www.moxa.com/en/support/product-support/security-advisory/mpsa-256421-cve-2025-5191-unquoted-search-path-vulnerability-in-the-utility-for-industrial-computers-(windows)

History

Aug 25, 2025 10:15 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Microsoft Microsoft windows Moxa Moxa drp-a100 Moxa drp-c100 Moxa serial Interface Service Moxa utility For Moxa Industrial Computers
Vendors & Products		Microsoft Microsoft windows Moxa Moxa drp-a100 Moxa drp-c100 Moxa serial Interface Service Moxa utility For Moxa Industrial Computers

Aug 25, 2025 2:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Aug 25, 2025 8:15 AM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		An Unquoted Search Path vulnerability has been identified in the utility for Moxa’s industrial computers (Windows). Due to the unquoted path configuration in the SerialInterfaceService.exe utility, a local attacker with limited privileges could place a malicious executable in a higher-priority directory within the search path. When the Serial Interface service starts, the malicious executable could be run with SYSTEM privileges. Successful exploitation could allow privilege escalation or enable an attacker to maintain persistence on the affected system. While successful exploitation can severely impact the confidentiality, integrity, and availability of the affected device itself, there is no loss of confidentiality, integrity, or availability within any subsequent systems.
Title		Unquoted Search Path Vulnerability in the Utility for Industrial Computers (Windows)
Weaknesses		CWE-428
References		https://www.moxa.com/en/support/product-support/security-advisory/mpsa-256421-cve-2025-5191-unquoted-search-path-vulnerability-in-the-utility-for-industrial-computers-(windows)
Metrics		cvssV4_0 `{'score': 7.3, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}`