# CVE-2020-27607: Information disclosure in n/a

> A malicious server can capture and transmit audio from muted clients because the mute button only stops server-side processing, not client-side transmission.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:** 21 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-57h6-vpq8-cwg3

## What is CVE-2020-27607?

CVE-2020-27607 is a medium-severity vulnerability in n/a, published on 21 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In BigBlueButton before 2.2.28 (or earlier), the client-side Mute button only signifies that the server should stop accepting audio data from the client. It does not directly configure the client to stop sending audio data to the server, and thus a modified server could store the audio data and/or transmit it to one or more meeting participants or other third parties.

## Which versions are affected by CVE-2020-27607?

It affects 1 product.


Products: Bigbluebutton Bigbluebutton.

## How do I fix CVE-2020-27607?

No fix has been published for CVE-2020-27607 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27607 being exploited?

There is no known exploitation of CVE-2020-27607 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-27602](https://insights.sbomify.com/CVE-2020-27602/): Other in n/a (critical 9.8)
- [CVE-2020-27605](https://insights.sbomify.com/CVE-2020-27605/): Code injection in n/a (critical 9.8)
- [CVE-2020-12443](https://insights.sbomify.com/CVE-2020-12443/): Path traversal in n/a (critical 9.8)
- [CVE-2020-27613](https://insights.sbomify.com/CVE-2020-27613/): Hardcoded credentials in n/a (high 8.4)
- [CVE-2021-4143](https://insights.sbomify.com/CVE-2021-4143/): Cross-site Scripting (XSS) - Generic in bigbluebutton/bigbluebutton (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27607 and fix it if it is affected.

What it is: CVE-2020-27607 is a medium-severity vulnerability in n/a, published on 21 Oct 2020. 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-2020-27607 in the wild and no public exploit code.

Affected product: n/a. 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-2020-27607/ (Markdown: https://insights.sbomify.com/CVE-2020-27607/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27607
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27607
- OSV: https://osv.dev/vulnerability/CVE-2020-27607

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27607/
Summaries are generated and may contain mistakes; the official description above is the record.