Vulnerability · Published Nov 26, 2025 · Assigned by Gridware
CVE-2025-66266Insecure SYSTEM Service Permissions in UPSilon2000V6.0 (RupsMon.exe) leading to trivial Local Privilege Escalation
Critical 9.3
In plain English
A critical-severity privilege mismanagement in UPSilon2000V6.0 from MegaTec Taiwan. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).
Official 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
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MegaTec Taiwan | UPSilon2000V6.0 | 6.0.5 |
Weakness: CWE-269 · Vector: 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