CVE-2021-47719— CNC_Ctrl DllUnregisterServer f5501 Access Violation
Quick assessment
Affected
COMMAX Co., Ltd. COMMAX WebViewer ActiveX Control
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
COMMAX WebViewer ActiveX Control是韩国COMMAX公司的一个浏览器插件。 COMMAX WebViewer ActiveX Control 2.1.4.5版本存在缓冲区错误漏洞，该漏洞源于Commax_WebViewer.ocx存在缓冲区溢出问题，可能导致执行任意代码。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2021-47719
Vulnerability Information
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Vulnerability Title
CNC_Ctrl DllUnregisterServer f5501 Access Violation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
COMMAX WebViewer ActiveX Control 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
COMMAX WebViewer ActiveX Control是韩国COMMAX公司的一个浏览器插件。 COMMAX WebViewer ActiveX Control 2.1.4.5版本存在缓冲区错误漏洞，该漏洞源于Commax_WebViewer.ocx存在缓冲区溢出问题，可能导致执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| COMMAX Co., Ltd. | COMMAX WebViewer ActiveX Control | 2.1.4.5 | - |
|
II. Public POCs for CVE-2021-47719
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Exploits & Public PoCs for CVE-2021-47719 (1)
Other References for CVE-2021-47719 (4)
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https://www.commax.com product
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https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5663.php third-party-advisory
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https://www.vulncheck.com/advisories/cncctrl-dllunregisterserver-f-access-violation third-party-advisory
Same Patch Batch · COMMAX Co., Ltd. · 2025-12-09 · 7 CVEs total
| CVE-2021-47709 | COMMAX Smart Home Ruvie CCTV Bridge DVR Service Config Write / DoS | |
| CVE-2021-47708 | COMMAX Smart Home IoT Control System SQL Injection Authentication Bypass | |
| CVE-2021-47710 | COMMAX Smart Home Ruvie CCTV Bridge DVR Service RTSP Credentials Disclosure | |
| CVE-2021-47705 | CNC_Ctrl DllUnregisterServer Access Violation | |
| CVE-2021-47707 | COMMAX CVD-Axx DVR Weak Default Credentials Stream Disclosure | |
| CVE-2021-47706 | COMMAX Biometric Access Control System Authentication Bypass |
IV. Related Vulnerabilities
Same vendor: COMMAX Co., Ltd.
-
CVE-2021-47743
COMMAX Biometric Access Control System 1.0.0 Reflected XSS v -
CVE-2021-47710
COMMAX Smart Home Ruvie CCTV Bridge DVR Service RTSP Credent -
CVE-2021-47709
COMMAX Smart Home Ruvie CCTV Bridge DVR Service Config Write -
CVE-2021-47708
COMMAX Smart Home IoT Control System SQL Injection Authentic -
CVE-2021-47707
COMMAX CVD-Axx DVR Weak Default Credentials Stream Disclosur
V. Comments for CVE-2021-47719
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