# CVE-2021-20017: Command injection in SMA100

> Authenticated attackers can execute arbitrary OS commands on SonicWall SMA100 devices, potentially compromising the appliance.

- **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:** 13 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-q863-p6pj-6qfj

## What is CVE-2021-20017?

CVE-2021-20017 is a high-severity command injection vulnerability in SonicWall SMA100, published on 13 Mar 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A post-authenticated command injection vulnerability in SonicWall SMA100 allows an authenticated attacker to execute OS commands as a 'nobody' user. This vulnerability impacts SMA100 version 10.2.0.5 and earlier.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2021-20017?

It affects 1 product.


Products: Sonicwall Sma100 Firmware.

## How do I fix CVE-2021-20017?

No fix has been published for CVE-2021-20017 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20017 being exploited?

There is no known exploitation of CVE-2021-20017 in the wild and no public exploit code.

## Other vulnerabilities in SonicWall SMA100

- [CVE-2020-5132](https://insights.sbomify.com/CVE-2020-5132/): Information disclosure in SMA100 (medium 5.3)
- [CVE-2021-20018](https://insights.sbomify.com/CVE-2021-20018/): Information disclosure in SMA100 (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20017 and fix it if it is affected.

What it is: CVE-2021-20017 is a high-severity command injection vulnerability in SonicWall SMA100, published on 13 Mar 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-2021-20017 in the wild and no public exploit code.

Affected product: SonicWall SMA100. 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-2021-20017/ (Markdown: https://insights.sbomify.com/CVE-2021-20017/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20017
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20017
- OSV: https://osv.dev/vulnerability/CVE-2021-20017

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20017/
Summaries are generated and may contain mistakes; the official description above is the record.