Check Point Advisories

Citrix NetScaler Out-of-Bounds Read (CVE-2025-5777)

Vulnerability
Protection

Check Point Reference:	CPAI-2025-0491
Date Published:	1 Jul 2025
Severity:	High
Last Updated:	Monday 21 July, 2025
Source:
Industry Reference:	CVE-2025-5777
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Citrix NetScaler ADC 14.1 prior to 14.1-43.56 Citrix NetScaler Gateway 14.1 prior to 14.1-43.56 Citrix NetScaler ADC 13.1 prior to 13.1-58.32 Citrix NetScaler Gateway 13.1 prior to 13.1-58.32 Citrix NetScaler ADC 13.1-FIPS and NDcPP prior to 13.1-37.235-FIPS and NDcPP Citrix NetScaler ADC 12.1-FIPS prior to 12.1-55.328-FIPS
Vulnerability Description	An out of bounds read vulnerability exists in Citrix NetScaler. Successful exploitation of this vulnerability could lead to memory overread.

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 Out-of-Bounds Read (CVE-2025-5777) 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 Out-of-Bounds Read (CVE-2025-5777)