Buffer Overflow Vulnerability in COMMAX WebViewer ActiveX Control
CVE-2021-47719

8.7HIGH

Key Information:

Vendor

Commax Co., Ltd.

Status
Commax Webviewer Activex Control
Vendor
CVE Published:
9 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47719?

The COMMAX WebViewer ActiveX Control version 2.1.4.5 is prone to a buffer overflow vulnerability that arises when handling excessively long string arrays through multiple functions. This flaw allows attackers to trigger boundary errors within the Commax_WebViewer.ocx module, potentially leading to arbitrary code execution. Exploitation of this vulnerability can expose systems to significant risks, allowing unauthorized actions and access.

Affected Version(s)

COMMAX WebViewer ActiveX Control 2.1.4.5

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47719 - Proof of Concept

References

https://www.exploit-db.com/exploits/50231
exploit
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-56...
third-party-advisory
https://www.commax.com
product

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LiquidWorm as Gjoko Krstic of Zero Science Lab
JSON
.
CVE-2021-47719 : Buffer Overflow Vulnerability in COMMAX WebViewer ActiveX Control