by Kastro
Paper/Archive/CVE-2025-66266

CVE-2025-66266

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

EPSS 0.1%CVSS 9.3
critical.is priorityof 100
29
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 3.9.039 × 200.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
UPSilon2000V6.06.0.5–CNA

Scores by source

Gridware (CNA)9.3CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refmegatec.com.tw/software-download