COMMAX WebViewer ActiveX Control 2.1.4.5 Commax_WebViewer.ocx out-of-bounds write

Summaryinfo

A vulnerability classified as critical has been found in COMMAX WebViewer ActiveX Control 2.1.4.5. This issue affects some unknown processing of the file Commax_WebViewer.ocx. The manipulation leads to out-of-bounds write. This vulnerability is uniquely identified as CVE-2021-47719. The attack is possible to be carried out remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in COMMAX WebViewer ActiveX Control 2.1.4.5. It has been rated as critical. This issue affects some unknown processing of the file Commax_WebViewer.ocx. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed by Gjoko Krstic as 50231. The advisory is shared at exploit-db.com. The identification of this vulnerability is CVE-2021-47719 since 12/05/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details as well as a public exploit are known.

The exploit is available at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (50231). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• COMMAX

Name

• WebViewer ActiveX Control

Version

• 2.1.4.5

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Exploitinginfo

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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