CVE-2025-66265 - Vulnerability Details - OpenCVE

CMService.exe creates the C:\\usr directory and subdirectories with insecure permissions, granting write access to all authenticated users. This allows attackers to replace configuration files (such as snmp.conf) or hijack DLLs to escalate privileges.

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact Low

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Megatec	Upsilon2000
Microsoft	Windows

No data.

No data.

References

Link	Providers
https://www.megatec.com.tw/software-download/

History

Thu, 27 Nov 2025 16:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Megatec Megatec upsilon2000 Microsoft Microsoft windows
Vendors & Products		Megatec Megatec upsilon2000 Microsoft Microsoft windows

Wed, 26 Nov 2025 16:15:00 +0000

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

Wed, 26 Nov 2025 01:15:00 +0000

Type	Values Removed	Values Added
Description		CMService.exe creates the C:\\usr directory and subdirectories with insecure permissions, granting write access to all authenticated users. This allows attackers to replace configuration files (such as snmp.conf) or hijack DLLs to escalate privileges.
Title		Insecure permissions in configuration directory (C:\\usr)
Weaknesses		CWE-269
References		https://www.megatec.com.tw/software-download/
Metrics		cvssV4_0 `{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:L/SA:L'}`

MITRE

Status: PUBLISHED

Assigner: Gridware

Published: 2025-11-26T01:12:50.505Z

Updated: 2025-11-26T15:31:02.065Z

Reserved: 2025-11-26T01:02:56.464Z

Link: CVE-2025-66265

Vulnrichment

Updated: 2025-11-26T15:30:57.370Z

NVD

Status : Received

Published: 2025-11-26T01:16:10.173

Modified: 2025-11-26T01:16:10.173

Link: CVE-2025-66265

Redhat

No data.

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