# CVE-2021-42703: AzeoTech DAQFactory

> An attacker can inject malicious JavaScript to hijack user sessions and redirect users to malicious pages in Advantech HMI Designer.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Nov 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-g22f-95g3-fg47

## What is CVE-2021-42703?

CVE-2021-42703 is a medium-severity cross-site scripting vulnerability in Advantech HMI Designer, published on 15 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

This vulnerability could allow an attacker to send malicious Javascript code resulting in hijacking of the user’s cookie/session tokens, redirecting the user to a malicious webpage, and performing unintended browser action.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-42703?

It affects 1 product.


Products: Advantech Webaccess Hmi Designer.

## How do I fix CVE-2021-42703?

No fix has been published for CVE-2021-42703 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42703 being exploited?

There is no known exploitation of CVE-2021-42703 in the wild and no public exploit code.

## Other vulnerabilities in Advantech HMI Designer

- [CVE-2019-10961](https://insights.sbomify.com/CVE-2019-10961/): Memory corruption in Advantech WebAccess HMI Designer (high 8.8)
- [CVE-2021-42706](https://insights.sbomify.com/CVE-2021-42706/): AzeoTech DAQFactory (high 7.8)
- [CVE-2018-8833](https://insights.sbomify.com/CVE-2018-8833/): Memory corruption in Advantech WebAccess HMI Designer (high 7.8)
- [CVE-2018-8835](https://insights.sbomify.com/CVE-2018-8835/): Use after free in Advantech WebAccess HMI Designer (high 7.8)
- [CVE-2018-8837](https://insights.sbomify.com/CVE-2018-8837/): Memory corruption in Advantech WebAccess HMI Designer (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42703 and fix it if it is affected.

What it is: CVE-2021-42703 is a medium-severity cross-site scripting vulnerability in Advantech HMI Designer, published on 15 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-42703 in the wild and no public exploit code.

Affected product: Advantech 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-2021-42703/ (Markdown: https://insights.sbomify.com/CVE-2021-42703/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42703
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42703
- OSV: https://osv.dev/vulnerability/CVE-2021-42703

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42703/
Summaries are generated and may contain mistakes; the official description above is the record.