PatchTheCVECVE-2025-66266: The RupsMon.exe service executable in UPSilon 2000 has insecure permissions, allowing the 'Everyone' group Ful
CVE-2025-66266 is a critical-severity flaw (CVSS 9.3) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- Critical severity
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 9.3 (Critical) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.1% (top 96%) |
| CISA exploited list | No |
| Weakness | CWE-269 |
| Published | 2025-11-26 |
| Last modified | 2026-10-18 |
Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-66266?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2025-66266 being exploited?
CVE-2025-66266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-66266 affect?
CVE-2025-66266 affects affected software. Severity is critical (CVSS 9.3). 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 ch
How urgent is CVE-2025-66266?
Priority 34/100. Critical severity