# CVE-2021-37999: Cross-site scripting in Chrome

> Remote attackers can inject arbitrary scripts or HTML into new browser tabs via crafted pages, requiring users to update Chrome.

- **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:** Yes
- **Published:** 23 Nov 2021
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-37999, GHSA-pr36-w94p-68r3, UBUNTU-CVE-2021-37999

## What is CVE-2021-37999?

CVE-2021-37999 is a medium-severity cross-site scripting vulnerability in Debian Debian Linux, published on 23 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

Insufficient data validation in New Tab Page in Google Chrome prior to 95.0.4638.69 allowed a remote attacker to inject arbitrary scripts or HTML in a new browser tab via a crafted HTML page.

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

## Which versions are affected by CVE-2021-37999?

It affects 3 products.


Products: Debian Debian Linux, Fedoraproject Fedora, Google Chrome.

## How do I fix CVE-2021-37999?

Upgrade to a fixed version.

## Is CVE-2021-37999 being exploited?

There is no known exploitation of CVE-2021-37999 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-37999 and fix it if it is affected.

What it is: CVE-2021-37999 is a medium-severity cross-site scripting vulnerability in Debian Debian Linux, published on 23 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-2021-37999 in the wild and no public exploit code.

Affected product: Debian Debian 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-2021-37999/ (Markdown: https://insights.sbomify.com/CVE-2021-37999/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-37999
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-37999
- OSV: https://osv.dev/vulnerability/CVE-2021-37999

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-37999/
Summaries are generated and may contain mistakes; the official description above is the record.