CVE-2021-47705
CNC_Ctrl DllUnregisterServer Access Violation
- State
- Published
- Severity
- 8.7 High
- Published
- Dec 9, 2025
- Updated
- Apr 7, 2026
- Reserved
- Dec 5, 2025
Description
COMMAX UMS Client ActiveX Control 1.7.0.2 contains a heap-based buffer overflow vulnerability that allows attackers to execute arbitrary code by providing excessively long string arrays through multiple functions. Attackers can exploit improper boundary validation in CNC_Ctrl.dll to cause heap corruption and potentially gain system-level access.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
COMMAX UMS Client ActiveX ControlCOMMAX Co., Ltd. |
|
References
- ExploitDB-50232exploit
- Zero Science Lab Disclosure (ZSL-2021-5664)third-party-advisory
- Referencetechnical-description
- VulnCheck Advisory: CNC_Ctrl DllUnregisterServer Access Violationthird-party-advisory
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