COMMAX UMS Client ActiveX Control 1.7.0.2 (CNC_Ctrl.dll) Heap Buffer Overflow

Advisories

severity: high
date: December 9, 2025
Affecting: COMMAX UMS Client ActiveX Control 1.7.0.2
CVE: CVE-2021-47705
CWE: CWE-787 Out-of-bounds Write
CVSS: 8.7
CVSS V4 Vector: 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
References: ExploitDB-50232
Zero Science Lab Disclosure (ZSL-2021-5664)
COMMAX Vendor Homepage
Credit: LiquidWorm as Gjoko Krstic of Zero Science Lab
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.