CVE-2025-66266 - CVE House
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Status published Critical CVE-2025-66266

Insecure SYSTEM Service Permissions in UPSilon2000V6.0 (RupsMon.exe) leading to trivial Local Privilege Escalation

Vulnerability 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

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Abdul Mhanni

Affected Vendor

MegaTec Taiwan

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Affected Software

UPSilon2000V6.0
Vulnerable Versions:
6.0.5

Timeline

Official Publish: November 26th, 2025
Last Modified: November 26th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)