# CVE-2021-20035: SonicWall SMA100 Appliances OS Command Injection

> Remote authenticated attackers can inject arbitrary commands on SonicWall SMA100 devices, potentially causing denial of service.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Yes, since 16 Apr 2025 (CISA KEV)
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Sep 2021
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-g24w-7v2m-52xh

## What is CVE-2021-20035?

CVE-2021-20035 is a medium-severity command injection vulnerability in SonicWall SMA100, published on 27 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user which potentially leads to DoS.

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

## Which versions are affected by CVE-2021-20035?

It affects 5 products.


Products: Sonicwall Sma 200 Firmware, Sonicwall Sma 210 Firmware, Sonicwall Sma 400 Firmware, Sonicwall Sma 410 Firmware, Sonicwall Sma 500v.

## How do I fix CVE-2021-20035?

No fix has been published for CVE-2021-20035 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 7 May 2025.

## Is CVE-2021-20035 being exploited?

Yes. Attackers have exploited CVE-2021-20035 in the wild since at least 16 Apr 2025.

## Other vulnerabilities in SonicWall SMA100

- [CVE-2021-20038](https://insights.sbomify.com/CVE-2021-20038/): SonicWall SMA 100 Appliances Stack-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2023-44221](https://insights.sbomify.com/CVE-2023-44221/): SonicWall SMA100 Appliances OS Command Injection (high 7.2, exploited in the wild)
- [CVE-2022-22273](https://insights.sbomify.com/CVE-2022-22273/): Command injection in SonicWall SRA/SMA100 (critical 9.8)
- [CVE-2021-20042](https://insights.sbomify.com/CVE-2021-20042/): Server-side request forgery in SonicWall SMA100 (critical 9.8)
- [CVE-2021-20045](https://insights.sbomify.com/CVE-2021-20045/): Memory corruption in SonicWall SMA100 (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20035 and fix it if it is affected.

What it is: CVE-2021-20035 is a medium-severity command injection vulnerability in SonicWall SMA100, published on 27 Sep 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2021-20035 in the wild since at least 16 Apr 2025.

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-2021-20035/ (Markdown: https://insights.sbomify.com/CVE-2021-20035/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20035
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20035
- OSV: https://osv.dev/vulnerability/CVE-2021-20035

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20035/
Summaries are generated and may contain mistakes; the official description above is the record.