Check Point Advisories

Zyxel NAS Authentication Bypass (CVE-2023-4473)

Check Point Reference: CPAI-2023-1538
Date Published: 21 Feb 2024
Severity: Critical
Last Updated: Wednesday 08 May, 2024
Industry Reference:CVE-2023-4473
Protection Provided by:

Security Gateway
R81, R80, R77, R75

Who is Vulnerable? Zyxel NAS326 firmware 5.21(aazf.14)c0 and prior
Zyxel NAS542 firmware 5.21(ABAG.11)C0 and prior
Vulnerability Description An authentication bypass vulnerability exists in Zyxel NAS. Successful exploitation of this vulnerability would allow remote attackers to gain unauthorized access into the affected system.

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

  1. In the IPS tab, click Protections and find the Zyxel NAS Authentication Bypass (CVE-2023-4473) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Web Server Enforcement Violation.
Attack Information:  Zyxel NAS Authentication Bypass (CVE-2023-4473)

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