CVE-2025-66266 – Insecure SYSTEM Service Permissions in UPSilon2000V6.0 (RupsMon.exe) leading to trivial Local Privilege Escalation

CVE ID : CVE-2025-66266

Published : Nov. 26, 2025, 2:15 a.m. | 20 minutes 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

Severity: 9.3 | CRITICAL

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