Check Point Advisories

Squid Denial Of Service (CVE-2021-33620)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-1808
Date Published:	1 Aug 2023
Severity:	Medium
Last Updated:	Tuesday 01 August, 2023
Source:
Industry Reference:	CVE-2021-33620
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Squid-Cache prior to 4.15 Squid-Cache 5.0 and later, prior to 5.0.6
Vulnerability Description	A denial-of-service vulnerability exists in Squid. Successful exploitation of this vulnerability would allow a remote attacker to create a denial of service condition on 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 Squid Denial Of Service (CVE-2021-33620) 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: Proxy Server Enforcement Violation.
Attack Information: Squid Denial Of Service (CVE-2021-33620)