Is CVE-2021-33004 actively exploited?

No active exploitation of CVE-2021-33004 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-33004 be exploited remotely?

No. CVE-2021-33004 requires local access to exploit.

What is the CVSS score of CVE-2021-33004?

CVE-2021-33004 has a CVSS score of 7.8 (HIGH).

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HIGH

CVE-2021-33004

CWE-119Published: June 24, 2021· Updated: Jun 17, 2026

7.8

CVSS v3.1

Official Description

The affected product is vulnerable to memory corruption condition due to lack of proper validation of user supplied files, which may allow an attacker to execute arbitrary code. User interaction is required on the WebAccess HMI Designer (versions 2.1.9.95 and prior).

NVD Source

Technical Analysis

CVE-2021-33004 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.