# CVE-2021-20120: Cross-site request forgery in Arris SurfBoard SB8200

> Attackers can perform unauthorized configuration changes, such as resetting the admin password, via CSRF attacks on the Arris Surfboard SB8200 web interface.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** 21 Oct 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-mmqp-272f-v3vw

## What is CVE-2021-20120?

CVE-2021-20120 is a high-severity vulnerability in Arris SurfBoard SB8200, published on 21 Oct 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

The administration web interface for the Arris Surfboard SB8200 lacks any protections against cross-site request forgery attacks. This means that an attacker could make configuration changes (such as changing the administrative password) without the consent of the user.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2021-20120?

It affects 1 product.


Products: Commscope Arris Surfboard Sb8200 Firmware.

## How do I fix CVE-2021-20120?

No fix has been published for CVE-2021-20120 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20120 being exploited?

There is no known exploitation of CVE-2021-20120 in the wild and no public exploit code.

## Other vulnerabilities in Arris SurfBoard SB8200

- [CVE-2021-20119](https://insights.sbomify.com/CVE-2021-20119/): Auth bypass in Arris SurfBoard SB8200 (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20120 and fix it if it is affected.

What it is: CVE-2021-20120 is a high-severity vulnerability in Arris SurfBoard SB8200, published on 21 Oct 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-2021-20120 in the wild and no public exploit code.

Affected product: Arris SurfBoard SB8200. 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-2021-20120/ (Markdown: https://insights.sbomify.com/CVE-2021-20120/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20120
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20120
- OSV: https://osv.dev/vulnerability/CVE-2021-20120

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20120/
Summaries are generated and may contain mistakes; the official description above is the record.