Unquoted Service Path in UPSilon2000V6.0(RupsMon and USBMate) running as SYSTEM
Priority LOW 30CWE-428Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-428.
Summary
The RupsMon and USBMate services in UPSilon 2000 run with SYSTEM privileges and contain unquoted service paths. This allows a local attacker to perform path interception and escalate privileges if they have write permissions to the directories proceeding that of which the real service executables live in
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00126 2nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MegaTec Taiwan | UPSilon2000V6.0 | 6.0.5 | — | No fix listed | CNA |
- UPSilon2000V6.0 VendorMegaTec Taiwan Affected 6.0.5 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-66269
- 2026-10-03 Alias added: GHSA-2jxx-qpjm-mvc4
References
More MegaTec Taiwan vulnerabilities
- TI-2025-40748 Insecure SYSTEM Service Permissions in UPSilon2000V6.0 (RupsMon.exe) leading to trivial Local Privilege Escalation CVSS 4.0CRITICAL 9.3
- TI-2025-40746 Unquoted Service path in UPSilon2000V6.0 SYSTEM privilege service CVSS 4.0HIGH 7.2
- TI-2025-40747 Insecure permissions in configuration directory (C:\\usr) CVSS 4.0MEDIUM 6.9
Sources
- CVE-2025-66269 · CVE Program
- CVE-2025-66269 · NVD
- FIRST EPSS
- GHSA-2jxx-qpjm-mvc4 · GitHub Advisory Database · CC BY 4.0
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