CVE-2025-66266

CRITICAL EPSS 2.1%

Published Nov 26, 20257mo ago · Modified Jun 17, 20262w ago

9.3 CVSS 4.0

Critical

Published Nov 26, 2025 7mo ago

Last Modified Jun 17, 2026 2w ago

Description

The RupsMon.exe service executable in UPSilon 2000 has insecure permissions, allowing the 'Everyone' group Full Control. A local attacker can replace the executable with a malicious binary to execute code with SYSTEM privileges or simply change the config path of the service to a command; starting and stopping the service to immediately achieve code execution and privilege escalation

CVSS Details

Base Score

9.3

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Local

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

2.1% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-269 Improper Privilege Management Authorization

References 1

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.