Check Point Advisories

Buffalo Routers Directory Traversal (CVE-2021-20090; CVE-2021-20091)

Check Point Reference: CPAI-2021-0497
Date Published: 23 Aug 2021
Severity: Critical
Last Updated: Monday 23 August, 2021
Industry Reference:CVE-2021-20090
Protection Provided by:

Security Gateway
R81, R80, R77, R75

Who is Vulnerable? Buffalo WSR-2533DHPL2 firmware version through 1.02
Buffalo WSR-2533DHP3 firmware version through 1.24
Vulnerability Description A directory traversal vulnerability exists in Buffalo routers. Successful exploitation of this vulnerability could allow an attacker to access arbitrary files on 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 Buffalo Routers Directory Traversal (CVE-2021-20090) 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:  Application Servers Protection Violation.
Attack Information:  Buffalo Routers Directory Traversal (CVE-2021-20090)

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