# CVE-2021-34419: HTML injection in Zoom Linux client

> HTML injection in Zoom Linux client allows attackers to target meeting participants with social engineering attacks during screen sharing.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Nov 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-484c-hxgg-w2g4

## What is CVE-2021-34419?

CVE-2021-34419 is a low-severity cross-site scripting vulnerability in Zoom Client for Meetings for Ubuntu Linux, published on 11 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the Zoom Client for Meetings for Ubuntu Linux before version 5.1.0, there is an HTML injection flaw when sending a remote control request to a user in the process of in-meeting screen sharing. This could allow meeting participants to be targeted for social engineering attacks.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2021-34419?

It affects 1 product.


Products: Zoom Zoom Client for Meetings.

## How do I fix CVE-2021-34419?

No fix has been published for CVE-2021-34419 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-34419 being exploited?

There is no known exploitation of CVE-2021-34419 in the wild and no public exploit code.

## Other vulnerabilities in Zoom Client for Meetings for Ubuntu Linux

- [CVE-2021-34420](https://insights.sbomify.com/CVE-2021-34420/): Zoom Windows installation executable signature bypass (medium 4.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-34419 and fix it if it is affected.

What it is: CVE-2021-34419 is a low-severity cross-site scripting vulnerability in Zoom Client for Meetings for Ubuntu Linux, published on 11 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-34419 in the wild and no public exploit code.

Affected product: Zoom Client for Meetings for Ubuntu Linux. 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-2021-34419/ (Markdown: https://insights.sbomify.com/CVE-2021-34419/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-34419
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-34419
- OSV: https://osv.dev/vulnerability/CVE-2021-34419

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-34419/
Summaries are generated and may contain mistakes; the official description above is the record.