# CVE-2021-20049: Information disclosure in SonicWall SMA100

> Remote unauthenticated attackers can enumerate valid usernames via the password change API, exposing user account information.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-8j6m-2r2j-2f2x

## What is CVE-2021-20049?

CVE-2021-20049 is a high-severity vulnerability in SonicWall SMA100, published on 23 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in SonicWall SMA100 password change API allows a remote unauthenticated attacker to perform SMA100 username enumeration based on the server responses. This vulnerability impacts 10.2.1.2-24sv, 10.2.0.8-37sv and earlier 10.x versions.

Weakness: CWE-203 (Observable Discrepancy), CWE-204 (Observable Response Discrepancy)

## Which versions are affected by CVE-2021-20049?

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 Firmware.

## How do I fix CVE-2021-20049?

No fix has been published for CVE-2021-20049 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20049 being exploited?

There is no known exploitation of CVE-2021-20049 in the wild and no public exploit code.

## Other vulnerabilities in SonicWall SMA100

- [CVE-2021-20016](https://insights.sbomify.com/CVE-2021-20016/): SonicWall SSLVPN SMA100 SQL Injection (critical 9.8, exploited in the wild)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20049 and fix it if it is affected.

What it is: CVE-2021-20049 is a high-severity vulnerability in SonicWall SMA100, published on 23 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-20049 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-2021-20049/ (Markdown: https://insights.sbomify.com/CVE-2021-20049/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20049
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20049
- OSV: https://osv.dev/vulnerability/CVE-2021-20049

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20049/
Summaries are generated and may contain mistakes; the official description above is the record.