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CVE-2025-66265— Insecure permissions in configuration directory (C:\\usr)

Quick assessment

Affected
MegaTec Taiwan ClientMate
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.

MegaTec ClientMate是中国台湾鼎坚（MegaTec）公司的一个电源管理软件。 MegaTec ClientMate存在安全漏洞，该漏洞源于C:\usr目录权限不安全，可能导致配置文件被替换或DLL劫持。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.11% · P2
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I. Basic Information for CVE-2025-66265

Vulnerability Information
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Vulnerability Title
Insecure permissions in configuration directory (C:\\usr)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
MegaTec ClientMate 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MegaTec ClientMate是中国台湾鼎坚（MegaTec）公司的一个电源管理软件。 MegaTec ClientMate存在安全漏洞，该漏洞源于C:\usr目录权限不安全，可能导致配置文件被替换或DLL劫持。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MegaTec Taiwan ClientMate 6.2.2 -

II. Public POCs for CVE-2025-66265

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III. Intelligence Information for CVE-2025-66265

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Same Patch Batch · MegaTec Taiwan · 2025-11-26 · 4 CVEs total

CVE-2025-66264 Unquoted Service path in UPSilon2000V6.0 SYSTEM privilege service
CVE-2025-66269 Unquoted Service Path in UPSilon2000V6.0(RupsMon and USBMate) running as SYSTEM
CVE-2025-66266 Insecure SYSTEM Service Permissions in UPSilon2000V6.0 (RupsMon.exe) leading to trivial Lo

IV. Related Vulnerabilities

Same product: ClientMate
Same vendor: MegaTec Taiwan
Same weakness: CWE-269

V. Comments for CVE-2025-66265

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