# CVE-2021-25310: Command injection in n/a

> Authenticated attackers can execute arbitrary system commands with root privileges on unsupported Belkin Linksys routers via the web interface.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** 2 Feb 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-jcmg-8grx-m8j6

## What is CVE-2021-25310?

CVE-2021-25310 is a high-severity command injection vulnerability in n/a, published on 2 Feb 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The administration web interface on Belkin Linksys WRT160NL 1.0.04.002_US_20130619 devices allows remote authenticated attackers to execute system commands with root privileges via shell metacharacters in the ui_language POST parameter to the apply.cgi form endpoint. This occurs in do_upgrade_post in mini_httpd. NOTE: This vulnerability only affects products that are no longer supported by the maintaine

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-150 (Improper Neutralization of Escape, Meta, or Control Sequences)

## Which versions are affected by CVE-2021-25310?

It affects 1 product.


Products: Belkin Linksys Wrt160nl Firmware.

## How do I fix CVE-2021-25310?

No fix has been published for CVE-2021-25310 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-25310 being exploited?

There is no known exploitation of CVE-2021-25310 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25310 and fix it if it is affected.

What it is: CVE-2021-25310 is a high-severity command injection vulnerability in n/a, published on 2 Feb 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-25310 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-2021-25310/ (Markdown: https://insights.sbomify.com/CVE-2021-25310/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25310
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25310
- OSV: https://osv.dev/vulnerability/CVE-2021-25310

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-25310/
Summaries are generated and may contain mistakes; the official description above is the record.