Check Point Advisories

Cisco Catalyst SD-WAN Authentication Bypass (CVE-2026-20127)

Vulnerability
Protection

Check Point Reference:	CPAI-2026-1291
Date Published:	5 Mar 2026
Severity:	Critical
Last Updated:	Sunday 26 April, 2026
Source:
Industry Reference:	CVE-2026-20127
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Cisco Catalyst SD-WAN Manager prior to 20.9 Cisco Catalyst SD-WAN Manager 20.9 and later, prior to 20.9.8.2 Cisco Catalyst SD-WAN Manager 20.11 and later, prior to 20.12.6.1 Cisco Catalyst SD-WAN Manager 20.12 and later, prior to 20.12.5.3 Cisco Catalyst SD-WAN Manager 20.12 and later, prior to 20.12.6.1 Cisco Catalyst SD-WAN Manager 20.13 and later, prior to 20.15.4.2 Cisco Catalyst SD-WAN Manager 20.14 and later, prior to 20.15.4.2 Cisco Catalyst SD-WAN Manager 20.15 and later, prior to 20.15.4.2 Cisco Catalyst SD-WAN Manager 20.16 and later, prior to 20.18.2.1 Cisco Catalyst SD-WAN Manager 20.18 and later, prior to 20.18.2.1 Cisco Catalyst SD-WAN Controller prior to 20.9 Cisco Catalyst SD-WAN Controller 20.9 and later, prior to 20.9.8.2 Cisco Catalyst SD-WAN Controller 20.11 and later, prior to 20.12.6.1 Cisco Catalyst SD-WAN Controller 20.12 and later, prior to 20.12.5.3 Cisco Catalyst SD-WAN Controller 20.12 and later, prior to 20.12.6.1 Cisco Catalyst SD-WAN Controller 20.13 and later, prior to 20.15.4.2 Cisco Catalyst SD-WAN Controller 20.14 and later, prior to 20.15.4.2 Cisco Catalyst SD-WAN Controller 20.15 and later, prior to 20.15.4.2 Cisco Catalyst SD-WAN Controller 20.16 and later, prior to 20.18.2.1 Cisco Catalyst SD-WAN Controller 20.18 and later, prior to 20.18.2.1
Vulnerability Description	An authentication bypass vulnerability in Cisco Catalyst SD-WAN allows remote attackers to obtain administrative privileges by sending crafted requests to the affected systems. This could allow attackers to manipulate network configurations for the SD-WAN fabric.

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 Cisco Catalyst SD-WAN Authentication Bypass (CVE-2026-20127) 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: Cisco Protection Violation.
Attack Information: Cisco Catalyst SD-WAN Authentication Bypass (CVE-2026-20127)