How severe is CVE-2021-33004?

CVE-2021-33004 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33004 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33004?

CVE-2021-33004 affects Advantech Webaccess/hmi Designer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33004?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-33004 published?

CVE-2021-33004 was published on 2021-06-24 and last updated on 2026-06-17.

CVE-2021-33004

CVE-2021-33004 is a high-severity vulnerability in Advantech Webaccess/hmi Designer with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Advantech Webaccess/hmi Designer
Published: 2021-06-24
Last modified: 2026-06-17

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).

Frequently asked questions

What is CVE-2021-33004?: 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).
How severe is CVE-2021-33004?: CVE-2021-33004 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33004 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33004?: CVE-2021-33004 affects Advantech Webaccess/hmi Designer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33004?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-33004 published?: CVE-2021-33004 was published on 2021-06-24 and last updated on 2026-06-17.

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-173-01

Affected products (1)

cpe:2.3:a:advantech:webaccess\/hmi_designer:*:*:*:*:*:*:*:*

More vulnerabilities in Advantech Webaccess/hmi Designer

CVE-2021-33002 — High (CVSS 7.8): Opening a maliciously crafted project file may cause an out-of-bounds write, which may allow an attacker to execute…
CVE-2021-33000 — High (CVSS 7.8): Parsing a maliciously crafted project file may cause a heap-based buffer overflow, which may allow an attacker to…
CVE-2020-16229 — High (CVSS 7.8): Advantech WebAccess HMI Designer, Versions 2.1.9.31 and prior. Processing specially crafted project files lacking…
CVE-2020-16217 — High (CVSS 7.8): Advantech WebAccess HMI Designer, Versions 2.1.9.31 and prior. A double free vulnerability caused by processing…
CVE-2020-16215 — High (CVSS 7.8): Advantech WebAccess HMI Designer, Versions 2.1.9.31 and prior. Processing specially crafted project files lacking…
CVE-2020-16213 — High (CVSS 7.8): Advantech WebAccess HMI Designer, Versions 2.1.9.31 and prior. Processing specially crafted project files lacking…

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