Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-47705— CNC_Ctrl DllUnregisterServer Access Violation

Quick assessment

Affected
COMMAX Co., Ltd. COMMAX UMS Client 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 UMS Client ActiveX Control是韩国COMMAX公司的一个浏览器插件。 COMMAX UMS Client ActiveX Control 1.7.0.2版本存在缓冲区错误漏洞，该漏洞源于CNC_Ctrl.dll存在堆缓冲区溢出问题，可能导致执行任意代码。

AI Predicted 9.8 Difficulty: Easy EPSS 0.49% · P40
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-47705

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
CNC_Ctrl DllUnregisterServer Access Violation
Source: CVE Program / CVE List V5
Vulnerability 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.
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 UMS Client ActiveX Control 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
COMMAX UMS Client ActiveX Control是韩国COMMAX公司的一个浏览器插件。 COMMAX UMS Client ActiveX Control 1.7.0.2版本存在缓冲区错误漏洞，该漏洞源于CNC_Ctrl.dll存在堆缓冲区溢出问题，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 UMS Client ActiveX Control 1.7.0.2 -

II. Public POCs for CVE-2021-47705

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-47705

请登录查看更多情报信息。

Exploits & Public PoCs for CVE-2021-47705 (1)

Other References for CVE-2021-47705 (4)

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-2021-47707 COMMAX CVD-Axx DVR Weak Default Credentials Stream Disclosure
CVE-2021-47706 COMMAX Biometric Access Control System Authentication Bypass
CVE-2021-47719 CNC_Ctrl DllUnregisterServer f5501 Access Violation

IV. Related Vulnerabilities

Same vendor: COMMAX Co., Ltd.
Same weakness: CWE-787

V. Comments for CVE-2021-47705

No comments yet

Leave a comment