Check Point Advisories

Citrix NetScaler Denial of Service (CVE-2023-6549)

Vulnerability
Protection

Check Point Reference:	CPAI-2023-2082
Date Published:	7 Jul 2025
Severity:	High
Last Updated:	Monday 07 July, 2025
Source:
Industry Reference:	CVE-2023-6549
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Citrix NetScaler Application Delivery Controller 12.1 and later, prior to 12.1-55.302 Citrix NetScaler Application Delivery Controller 12.1 and later, prior to 12.1-55.302 Citrix NetScaler Application Delivery Controller 13.0 and later, prior to 13.0-92.21 Citrix NetScaler Application Delivery Controller 13.1 and later, prior to 13.1-37.176 Citrix NetScaler Application Delivery Controller 13.1 and later, prior to 13.1-51.15 Citrix NetScaler Application Delivery Controller 14.1 and later, prior to 14.1-12.35 Citrix NetScaler Gateway 13.0 and later, prior to 13.0-92.21 Citrix NetScaler Gateway 13.1 and later, prior to 13.1-51.15 Citrix NetScaler Gateway 14.1 and later, prior to 14.1-12.35
Vulnerability Description	A denial-of-service vulnerability exists in Citrix NetScaler. 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 Citrix NetScaler Denial of Service (CVE-2023-6549) 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: Citrix NetScaler Denial of Service (CVE-2023-6549)