Staying Safe in Times of Cyber Uncertainty
Check Point Advisories

SonicWall SSLVPN SMA100 Authentication Bypass (CVE-2021-20016)

Check Point Reference: CPAI-2021-1113
Date Published: 17 Apr 2022
Severity: Critical
Last Updated: Sunday 17 April, 2022
Industry Reference:CVE-2021-20016
Protection Provided by:

Security Gateway
R81, R80, R77, R75

Who is Vulnerable? SonicWall SSLVPN SMA100 build version 10.x
Vulnerability Description An authentication bypass vulnerability exists in SonicWall SSLVPN. Successful exploitation of this vulnerability would allow a remote attacker to obtain sensitive information.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

  1. In the IPS tab, click Protections and find the SonicWall SSLVPN SMA100 Authentication Bypass (CVE-2021-20016) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Web Server Enforcement Violation.
Attack Information:  SonicWall SSLVPN SMA100 Authentication Bypass (CVE-2021-20016)

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