# CVE-2021-21354: Open redirect in pollbot

> An attacker can redirect users to malicious sites via a crafted URL in Mozilla Pollbot, potentially facilitating phishing attacks.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/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:** 8 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-jhgx-wmq8-jc24

## What is CVE-2021-21354?

CVE-2021-21354 is a high-severity vulnerability in mozilla PollBot, published on 8 Mar 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

Pollbot is open source software which "frees its human masters from the toilsome task of polling for the state of things during the Firefox release process." In Pollbot before version 1.4.4 there is an open redirection vulnerability in the path of "https://pollbot.services.mozilla.com/". An attacker can redirect anyone to malicious sites. To Reproduce type in this URL: "https://pollbot.services.mozilla.com//evil.com/". Affected versions will redirect to that website when you inject a payload like "//evil.com/". This is fixed in version 1.4.4.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2021-21354?

It affects 1 product.


Products: Mozilla Pollbot.

## How do I fix CVE-2021-21354?

No fix has been published for CVE-2021-21354 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-21354 being exploited?

There is no known exploitation of CVE-2021-21354 in the wild and no public exploit code.

## Other vulnerabilities in mozilla PollBot

- [CVE-2022-0637](https://insights.sbomify.com/CVE-2022-0637/): open redirect in pollbot (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-21354 and fix it if it is affected.

What it is: CVE-2021-21354 is a high-severity vulnerability in mozilla PollBot, published on 8 Mar 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-2021-21354 in the wild and no public exploit code.

Affected product: mozilla PollBot. 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-2021-21354/ (Markdown: https://insights.sbomify.com/CVE-2021-21354/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-21354
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-21354
- OSV: https://osv.dev/vulnerability/CVE-2021-21354

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-21354/
Summaries are generated and may contain mistakes; the official description above is the record.