CVE-2021-47705: Commax Co., Ltd Commax Ums Client Activex Control

High severity, CVSS 8.7. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Commax Co., Ltd Commax Ums Client Activex Control: version 1.7.0.2 only

Published 2025-12-09. Last modified 2026-06-17.