# CVE-2021-20016: SonicWall SSLVPN SMA100 SQL Injection

> Remote unauthenticated attackers can exploit SQL injection in SonicWall SMA100 to access sensitive user credentials and session data.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 3 Nov 2021 (CISA KEV), used in ransomware
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Feb 2021
- **Updated:** 12 Aug 2026
- **Also known as:** GHSA-c283-6775-92m9

## What is CVE-2021-20016?

CVE-2021-20016 is a critical SQL injection vulnerability in SonicWall SMA100, published on 3 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A SQL-Injection vulnerability in the SonicWall SSLVPN SMA100 product allows a remote unauthenticated attacker to perform SQL query to access username password and other session related information. This vulnerability impacts SMA100 build version 10.x.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2021-20016?

It affects 6 products.


Products: Sonicwall Sma 100 Firmware, Sonicwall Sma 200 Firmware, Sonicwall Sma 210 Firmware, Sonicwall Sma 400 Firmware, Sonicwall Sma 410 Firmware, Sonicwall Sma 500v.

## How do I fix CVE-2021-20016?

No fix has been published for CVE-2021-20016 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.

## Is CVE-2021-20016 being exploited?

Yes. Attackers have exploited CVE-2021-20016 in the wild since at least 3 Nov 2021, including in ransomware campaigns.

## Other vulnerabilities in SonicWall SMA100

- [CVE-2019-7483](https://insights.sbomify.com/CVE-2019-7483/): SonicWall SMA100 Directory Traversal (high 7.5, exploited in the wild)
- [CVE-2019-7481](https://insights.sbomify.com/CVE-2019-7481/): SonicWall SMA100 SQL Injection (high 7.5, exploited in the wild)
- [CVE-2019-7482](https://insights.sbomify.com/CVE-2019-7482/): Memory corruption in SMA100 (critical 9.8)
- [CVE-2025-32819](https://insights.sbomify.com/CVE-2025-32819/): Path traversal in SMA100 (high 8.8)
- [CVE-2019-7485](https://insights.sbomify.com/CVE-2019-7485/): Memory corruption in SMA100 (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20016 and fix it if it is affected.

What it is: CVE-2021-20016 is a critical SQL injection vulnerability in SonicWall SMA100, published on 3 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2021-20016 in the wild since at least 3 Nov 2021, including in ransomware campaigns.

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-2021-20016/ (Markdown: https://insights.sbomify.com/CVE-2021-20016/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20016
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20016
- OSV: https://osv.dev/vulnerability/CVE-2021-20016

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20016/
Summaries are generated and may contain mistakes; the official description above is the record.