Check Point Advisories

Netgate pfSense Cross-Site Scripting (CVE-2021-27933)

Check Point Reference: CPAI-2021-0297
Date Published: 18 May 2021
Severity: High
Last Updated: 18 May 2021
Industry Reference:CVE-2021-27933
Protection Provided by:

Security Gateway
R80, R77, R75

Who is Vulnerable? pfSense
Vulnerability Description A stored cross-site scripting vulnerability exists in Netgate pfSense. The vulnerability is due to improper validation of the descr parameter in the services_wol_edit.php.

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 R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Netgate pfSense Cross-Site Scripting (CVE-2021-27933) 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:  HP Products Protection Violation.
Attack Information:  Netgate pfSense Cross-Site Scripting (CVE-2021-27933)

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