Check Point Advisories

H2O.ai H2O-3 Insecure Deserialization (CVE-2025-6507)

Vulnerability
Protection

Check Point Reference:	CPAI-2025-1585
Date Published:	16 Sep 2025
Severity:	High
Last Updated:	Tuesday 16 September, 2025
Source:
Industry Reference:	CVE-2025-6507
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	H2O.ai H2O-3 version 3.47.0.99999
Vulnerability Description	An insecure deserialization vulnerability in H2O.ai H2O-3 allows attackers to exploit deserialization of untrusted data, potentially leading to arbitrary code execution and reading of system files.

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 H2O.ai H2O-3 Insecure Deserialization (CVE-2025-6507) 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: H2O.ai H2O-3 Insecure Deserialization (CVE-2025-6507)