CVE-2021-47719

CNC_Ctrl DllUnregisterServer f5501 Access Violation

CVSS 8.7 HIGHEPSS 0.4%CWE-787

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.7EPSS 0.4%KEV nãoPoC —Patch —

Lifecycle

09 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

COMMAX Co., Ltd. · COMMAX WebViewer ActiveX Control

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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