What’s Vulnerable › Vulnerabilities
CVE-2021-47719: CNC_Ctrl DllUnregisterServer f5501 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 WebViewer ActiveX Control 2.1.4.5 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by providing excessively long string arrays through multiple functions. Attackers can exploit boundary errors in Commax_WebViewer.ocx to cause buffer overflow conditions and potentially gain code execution.
Affected products
References
- https://www.commax.com
- https://www.exploit-db.com/exploits/50231
- https://www.vulncheck.com/advisories/commax-webviewer-activex-control-commax-webviewer-ocx-buffer-overflow
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5663.php
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