CVE-2021-47705

HIGH

COMMAX UMS Client ActiveX Control 1.7.0.2 - Buffer Overflow

Title source: llm

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.

Exploits (1)

exploitdb WORKING POC

by LiquidWorm · textwebappshardware

https://www.exploit-db.com/exploits/50232

View Code ZIP pw:eip

References (4)

[Exploit, Third Party Advisory] https://www.exploit-db.com/exploits/50232

[Various Sources] https://www.commax.com

[Third Party Advisory] https://www.vulncheck.com/advisories/commax-ums-client-activex-control-cnc-ctrl-dll-heap-buffer-overflow

[Third Party Advisory] https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5664.php

Scores

CVSS v4 8.7

EPSS 0.0014

EPSS Percentile 33.3%

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-787

Status published

Products (1)

COMMAX Co., Ltd./COMMAX UMS Client ActiveX Control 1.7.0.2

Published Dec 09, 2025

Tracked Since Feb 18, 2026