Check Point Advisories

Mozilla Multiple Products Out of Bounds Read (CVE-2025-4919)

Vulnerability
Protection

Check Point Reference:	CPAI-2025-0564
Date Published:	24 Jul 2025
Severity:	High
Last Updated:	Thursday 24 July, 2025
Source:
Industry Reference:	CVE-2025-4919
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Mozilla Firefox ESR prior to v115.23.1 Mozilla Firefox prior to v138.0.4 Mozilla Firefox ESR v116.0 and later, prior to v128.10.1 Mozilla Thunderbird prior to v128.10.2 Mozilla Thunderbird v138.0 and later, prior to v138.0.2
Vulnerability Description	An out of bounds read vulnerability exists in multiple Mozilla products. Successful exploitation of this vulnerability could allow a remote attacker to obtain sensitive information.

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 Mozilla Multiple Products Out of Bounds Read (CVE-2025-4919) 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 Client Enforcement Violation.
Attack Information: Mozilla Multiple Products Out of Bounds Read (CVE-2025-4919)