# CVE-2021-20784: Cross-site scripting in Everything

> Remote attackers can inject arbitrary scripts or alter the website via HTTP header injection in the Everything file search utility.

- **Severity:** Medium 6.1 (`CVSS:3.0/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:** 14 Jul 2021
- **Updated:** 3 Dec 2024
- **Also known as:** GHSA-vxfp-88g2-6m62

## What is CVE-2021-20784?

CVE-2021-20784 is a medium-severity cross-site scripting vulnerability in voidtools Everything, published on 14 Jul 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

HTTP header injection vulnerability in Everything version 1.0, 1.1, and 1.2 except the Lite version may allow a remote attacker to inject an arbitrary script or alter the website that uses the product.

Weakness: CWE-644 (Improper Neutralization of HTTP Headers for Scripting Syntax)

## Which versions are affected by CVE-2021-20784?

It affects 1 product.


Products: Voidtools Everything.

## How do I fix CVE-2021-20784?

No fix has been published for CVE-2021-20784 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20784 being exploited?

There is no known exploitation of CVE-2021-20784 in the wild and no public exploit code.

## Other vulnerabilities in voidtools Everything

- [CVE-2020-24567](https://insights.sbomify.com/CVE-2020-24567/): Privilege escalation in n/a (high 7.8)
- [CVE-2023-27704](https://insights.sbomify.com/CVE-2023-27704/): Denial of service in n/a (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20784 and fix it if it is affected.

What it is: CVE-2021-20784 is a medium-severity cross-site scripting vulnerability in voidtools Everything, published on 14 Jul 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-2021-20784 in the wild and no public exploit code.

Affected product: voidtools Everything. 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-2021-20784/ (Markdown: https://insights.sbomify.com/CVE-2021-20784/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20784
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20784
- OSV: https://osv.dev/vulnerability/CVE-2021-20784

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20784/
Summaries are generated and may contain mistakes; the official description above is the record.