CVE-2021-33000

Name: CVE-2021-33000
Creator: NVD / NIST
Published: 2021-06-24T18:15:08.54+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2021-33000 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Parsing a maliciously crafted project file may cause a heap-based buffer overflow, which may allow an attacker to perform arbitrary code execution. User interaction is required on the WebAccess HMI Designer (versions 2.1.9.95 and prior).. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

Parsing a maliciously crafted project file may cause a heap-based buffer overflow, which may allow an attacker to perform arbitrary code execution. User interaction is required on the WebAccess HMI Designer (versions 2.1.9.95 and prior).

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

1.04%

59.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Advantech	Webaccess\/Hmi Designer	<= 2.1.9.95

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-173-01Third Party Advisory, US Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-21-173-01Third Party Advisory, US Government Resource

Timeline

Published: Jun 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33000?

How severe is CVE-2021-33000?

CVE-2021-33000 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33000?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-33000?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST