# CVE-2021-33004: Memory corruption in WebAccess HMI Designer

> An attacker can execute arbitrary code by tricking a user into opening a malicious file in WebAccess HMI Designer.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 24 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-q569-xrrr-6gvr

## What is CVE-2021-33004?

CVE-2021-33004 is a high-severity memory corruption vulnerability in WebAccess HMI Designer, published on 24 Jun 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### 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).

Weakness: CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2021-33004?

It affects 1 product.


Products: Advantech Webaccess\/Hmi Designer.

## How do I fix CVE-2021-33004?

No fix has been published for CVE-2021-33004 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33004 being exploited?

There is no known exploitation of CVE-2021-33004 in the wild and no public exploit code.

## Other vulnerabilities in WebAccess HMI Designer

- [CVE-2021-33000](https://insights.sbomify.com/CVE-2021-33000/): Memory corruption in WebAccess HMI Designer (high 7.8)
- [CVE-2021-33002](https://insights.sbomify.com/CVE-2021-33002/): Memory corruption in WebAccess HMI Designer (high 7.8)
- [CVE-2020-16207](https://insights.sbomify.com/CVE-2020-16207/): Memory corruption in Advantech WebAccess HMI Designer (high 7.8)
- [CVE-2020-16213](https://insights.sbomify.com/CVE-2020-16213/): Memory corruption in Advantech WebAccess HMI Designer (high 7.8)
- [CVE-2020-16215](https://insights.sbomify.com/CVE-2020-16215/): Memory corruption in Advantech WebAccess HMI Designer (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33004 and fix it if it is affected.

What it is: CVE-2021-33004 is a high-severity memory corruption vulnerability in WebAccess HMI Designer, published on 24 Jun 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-33004 in the wild and no public exploit code.

Affected product: WebAccess HMI Designer. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-33004/ (Markdown: https://insights.sbomify.com/CVE-2021-33004/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33004
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33004
- OSV: https://osv.dev/vulnerability/CVE-2021-33004

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33004/
Summaries are generated and may contain mistakes; the official description above is the record.