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CVE-2021-20016

CRITICAL9.8
CISA KEV

Published 2021-02-04 · Updated 2026-08-12 · Source PSIRT@sonicwall.com

Summary

CVE-2021-20016 is a critical-severity (CVSS 9.8) vulnerability in SonicWall SSLVPN SMA100. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by November 17, 2021. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. SonicWall has 19 vulnerabilities in the KEV catalog, 13 of them linked to ransomware.

All 19 known-exploited SonicWall vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-89CWE-89

CISA Known-Exploited Vulnerability

Product: SonicWall — SSLVPN SMA100

Name: SonicWall SSLVPN SMA100 SQL Injection Vulnerability

Date added: 2021-11-03 · Due: 2021-11-17

USED IN RANSOMWARE

Required action: Apply updates per vendor instructions.

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