# CVE-2021-33021: xArrow SCADA Cross-site Scripting

> An unauthorized attacker can execute arbitrary code via cross-site scripting in the xArrow SCADA system's alarm resource.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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:** 16 May 2022
- **Updated:** 16 Apr 2025
- **Also known as:** GHSA-8c36-rqcc-rv4q

## What is CVE-2021-33021?

CVE-2021-33021 is a medium-severity cross-site scripting vulnerability in xArrow SCADA, published on 16 May 2022. 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

xArrow SCADA versions 7.2 and prior is vulnerable to cross-site scripting due to parameter ‘edate’ of the resource xhisalarm.htm, which may allow an unauthorized attacker to execute arbitrary code.

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

## Which versions are affected by CVE-2021-33021?

It affects 1 product.


Products: Xarrow Xarrow.

## How do I fix CVE-2021-33021?

No fix has been published for CVE-2021-33021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33021 being exploited?

There is no known exploitation of CVE-2021-33021 in the wild and no public exploit code.

## Other vulnerabilities in xArrow SCADA

- [CVE-2012-2427](https://insights.sbomify.com/CVE-2012-2427/): Memory corruption in n/a (critical 10.0)
- [CVE-2012-2428](https://insights.sbomify.com/CVE-2012-2428/): Integer overflow in n/a (critical 10.0)
- [CVE-2012-2429](https://insights.sbomify.com/CVE-2012-2429/): Memory corruption in n/a (critical 10.0)
- [CVE-2012-2426](https://insights.sbomify.com/CVE-2012-2426/): Null dereference in n/a (high 7.8)
- [CVE-2021-33001](https://insights.sbomify.com/CVE-2021-33001/): xArrow SCADA Cross-site Scripting (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33021 and fix it if it is affected.

What it is: CVE-2021-33021 is a medium-severity cross-site scripting vulnerability in xArrow SCADA, published on 16 May 2022. 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-2021-33021 in the wild and no public exploit code.

Affected product: xArrow SCADA. 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-2021-33021/ (Markdown: https://insights.sbomify.com/CVE-2021-33021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33021
- OSV: https://osv.dev/vulnerability/CVE-2021-33021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33021/
Summaries are generated and may contain mistakes; the official description above is the record.