Check Point Advisories

SonicWall Sma 200 Firmware Authentication Bypass (CVE-2021-20042)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-2309
Date Published:	20 Apr 2025
Severity:	Critical
Last Updated:	Sunday 20 April, 2025
Source:
Industry Reference:	CVE-2021-20042
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	SonicWall Sma 200 Firmware 9.0.0.11-31sv SonicWall Sma 200 Firmware 10.2.0.8-37sv SonicWall Sma 200 Firmware 10.2.1.1-19sv
Vulnerability Description	An authentication bypass vulnerability exists in SonicWall Sma 200 Firmware. Successful exploitation of this vulnerability would allow remote attackers to gain unauthorized access into the affected system.

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

In the IPS tab, click Protections and find the SonicWall Sma 200 Firmware Authentication Bypass (CVE-2021-20042) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Web Server Enforcement Violation.
Attack Information: SonicWall Sma 200 Firmware Authentication Bypass (CVE-2021-20042)