What’s Vulnerable › Vulnerabilities
CVE-2021-47705: CNC_Ctrl DllUnregisterServer Access Violation
- Severity: high (CVSS 8.7 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-12-09 · updated 2026-06-17
- Weakness: CWE-787
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.
Affected products
References
- https://www.commax.com
- https://www.exploit-db.com/exploits/50232
- https://www.vulncheck.com/advisories/commax-ums-client-activex-control-cnc-ctrl-dll-heap-buffer-overflow
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5664.php
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