---
id: "CVE-2021-20016"
kind: "vulnerability"
aliases: ["CVE-2021-20016"]
title: "SonicWall SSLVPN SMA100: SonicWall SSLVPN SMA100 SQL Injection Vulnerability"
severity: "critical"
cvss: 9.8
epss: 0.40038
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "SonicWall SSLVPN SMA100", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "ransomware", "self-hosted", "sma100", "sonicwall", "vpn"]
not_affected_if: ["no-sma100-appliance"]
published_at: "2021-02-04T06:15:13+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:34+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-20016", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-20016", "first_seen_at": "2026-10-23T19:13:43+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20016", "first_seen_at": "2026-10-23T21:57:34+00:00"}]
---

# SonicWall SSLVPN SMA100: SonicWall SSLVPN SMA100 SQL Injection Vulnerability

SonicWall SMA100 SSL VPN appliances contain a SQL injection flaw that lets a remote, unauthenticated attacker run database queries. The attacker can use it to access credentials stored on the appliance.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:SonicWall SSLVPN SMA100 affected ? fixed ?

## Fix

Apply the SonicWall update for the SMA100 appliance per vendor instructions; the sources do not name a fixed version.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-20016
- 2026-10-23T19:13:43+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-20016
- 2026-10-23T21:57:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-20016

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_