CVE-2021-47705
High
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.
SeverityHigh
CVSS8.7
Exploit probability—
ProductCOMMAX UMS Client ActiveX Control
PublishedDec 9, 2025
First seenDec 9, 2025
Weakness typeCWE-787Out-of-bounds write
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| COMMAX Co., Ltd. COMMAX UMS Client ActiveX Control | 1.7.0.2 | — |
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