CVE-2025-66266
Critical
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
SeverityCritical
CVSS9.3
Exploit probability—
ProductUPSilon2000V6.0
PublishedNov 26, 2025
First seenNov 26, 2025
Weakness typeCWE-269Improper privilege management
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| MegaTec Taiwan UPSilon2000V6.0 | 6.0.5 | — |
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