# CVE-2020-12424: Security feature bypass in Firefox

> An attacker can bypass WebRTC permission prompts by supplying an untrusted URI, allowing unauthorized access to camera or microphone features.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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:** Yes
- **Published:** 9 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-2cqw-c249-qrpc, UBUNTU-CVE-2020-12424

## What is CVE-2020-12424?

CVE-2020-12424 is a medium-severity vulnerability in Mozilla Firefox, published on 9 Jul 2020. 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

When constructing a permission prompt for WebRTC, a URI was supplied from the content process. This URI was untrusted, and could have been the URI of an origin that was previously granted permission; bypassing the prompt. This vulnerability affects Firefox < 78.

Weakness: CWE-276 (Incorrect Default Permissions)

## Which versions are affected by CVE-2020-12424?

It affects 2 products.


Products: Mozilla Firefox, Opensuse Leap.

## How do I fix CVE-2020-12424?

Upgrade to a fixed version.

## Is CVE-2020-12424 being exploited?

There is no known exploitation of CVE-2020-12424 in the wild and no public exploit code.

## Other vulnerabilities in Mozilla Firefox

- [CVE-2019-11708](https://insights.sbomify.com/CVE-2019-11708/): Mozilla Firefox and Thunderbird Sandbox Escape (critical 10.0, exploited in the wild)
- [CVE-2010-3765](https://insights.sbomify.com/CVE-2010-3765/): Mozilla Multiple Products Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2022-26486](https://insights.sbomify.com/CVE-2022-26486/): Mozilla Firefox Use-After-Free (critical 9.6, exploited in the wild)
- [CVE-2022-26485](https://insights.sbomify.com/CVE-2022-26485/): Mozilla Firefox Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2019-11707](https://insights.sbomify.com/CVE-2019-11707/): Mozilla Firefox and Thunderbird Type Confusion (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-12424 and fix it if it is affected.

What it is: CVE-2020-12424 is a medium-severity vulnerability in Mozilla Firefox, published on 9 Jul 2020. 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-2020-12424 in the wild and no public exploit code.

Affected product: Mozilla Firefox. 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-2020-12424/ (Markdown: https://insights.sbomify.com/CVE-2020-12424/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-12424
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-12424
- OSV: https://osv.dev/vulnerability/CVE-2020-12424

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-12424/
Summaries are generated and may contain mistakes; the official description above is the record.