# CVE-2020-25820: Server-side request forgery in n/a

> Authenticated attackers can read local files and perform SSRF attacks via crafted URLs in uploaded Office documents.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-5mrj-23w8-w7hx

## What is CVE-2020-25820?

CVE-2020-25820 is a medium-severity server-side request forgery vulnerability in n/a, published on 21 Oct 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document that has a crafted URL in an ODF xlink field.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2020-25820?

It affects 1 product.


Products: Bigbluebutton Bigbluebutton.

## How do I fix CVE-2020-25820?

No fix has been published for CVE-2020-25820 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-25820 being exploited?

There is no known exploitation of CVE-2020-25820 in the wild and no public exploit code.

Public exploit code:

- BigBlueButton 2.2.25 - Arbitrary File Disclosure and Server-Side Request Forgery (exploitdb)

## 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-2020-25820 and fix it if it is affected.

What it is: CVE-2020-25820 is a medium-severity server-side request forgery vulnerability in n/a, published on 21 Oct 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-25820 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-2020-25820/ (Markdown: https://insights.sbomify.com/CVE-2020-25820/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-25820
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-25820
- OSV: https://osv.dev/vulnerability/CVE-2020-25820

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-25820/
Summaries are generated and may contain mistakes; the official description above is the record.