{"id":"CVE-2025-66266","aliases":["EUVD-2025-199688","GHSA-9553-998g-436x"],"status":"published","title":"Insecure SYSTEM Service Permissions in UPSilon2000V6.0 (RupsMon.exe) leading to trivial Local Privilege Escalation","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":{"version":"4.0","score":9.3,"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","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00146,"percentile":0.03947,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-269"],"published":"2025-11-26T01:16:40Z","modified":"2026-10-18T20:10:00Z","products":[{"vendor":"megatec taiwan","product":"upsilon2000v6.0"}],"references":[{"url":"https://www.megatec.com.tw/software-download/"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66266"},{"url":"https://www.megatec.com.tw/software-download"},{"url":"https://github.com/advisories/GHSA-9553-998g-436x"}],"sources":{"cve":[{"id":"CVE-2025-66266","title":"Insecure SYSTEM Service Permissions in UPSilon2000V6.0 (RupsMon.exe) leading to trivial Local Privilege Escalation","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","status":"published","published":"2025-11-26T01:16:40.731Z","modified":"2025-11-26T15:28:25.062Z","cvss":[{"version":"4.0","score":9.3,"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","level":"critical","assessor":"cna"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:32:53.475217Z"}],"euvd":[{"id":"EUVD-2025-199688","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","status":"published","published":"2025-11-26T01:16:40Z","modified":"2025-11-26T15:28:25Z","cvss":[{"version":"4.0","score":9.3,"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","level":"critical"}],"updated_at":"2026-11-02T19:49:12.440244Z"}],"ghsa":[{"id":"GHSA-9553-998g-436x","title":"The RupsMon.exe service executable in UPSilon 2000 has insecure permissions, allowing the ...","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","status":"published","published":"2025-11-26T03:30:22Z","modified":"2025-11-26T03:30:28Z","cvss":[{"version":"4.0","score":9.3,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T15:04:58.071945Z"}],"nvd":[{"id":"CVE-2025-66266","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","status":"published","published":"2025-11-26T02:15:49.977Z","modified":"2026-10-18T20:10:00.11Z","cvss":[{"version":"4.0","score":9.3,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:11:46.94029Z"}]}}