Check Point Advisories

OpenBSD OpenSSH Denial of Service (CVE-2025-26466)

Vulnerability
Protection

Check Point Reference:	CPAI-2025-13532
Date Published:	22 Mar 2026
Severity:	High
Last Updated:	Sunday 22 March, 2026
Source:
Industry Reference:	CVE-2025-26466
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	OpenBSD OpenSSH version 9.5 p1 OpenBSD OpenSSH version 9.6 OpenBSD OpenSSH version 9.6 p1 OpenBSD OpenSSH version 9.7 OpenBSD OpenSSH version 9.7 p1 OpenBSD OpenSSH version 9.8 OpenBSD OpenSSH version 9.8 p1 OpenBSD OpenSSH version 9.9 OpenBSD OpenSSH version 9.9 p1
Vulnerability Description	A denial of service vulnerability exists in OpenBSD OpenSSH. Successful exploitation would result in a crash of the server process leading to denial of service.

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 OpenBSD OpenSSH Denial of Service (CVE-2025-26466) 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: SSH Protection Violation.
Attack Information: OpenBSD OpenSSH Denial of Service (CVE-2025-26466)