CVE-2021-20090 : What You Need to Know

A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.

Understanding CVE-2021-20090

This section provides insights into the CVE-2021-20090 vulnerability affecting Buffalo WSR-2533DHPL2 and WSR-2533DHP3 devices.

What is CVE-2021-20090?

CVE-2021-20090 is a path traversal vulnerability present in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24. This flaw could be exploited by unauthenticated remote attackers to bypass authentication mechanisms.

The Impact of CVE-2021-20090

The impact of CVE-2021-20090 includes unauthorized access to sensitive information, potential data breaches, and compromise of affected devices, posing a significant security risk.

Technical Details of CVE-2021-20090

In this section, the technical aspects of CVE-2021-20090 vulnerability are discussed.

Vulnerability Description

The vulnerability allows remote attackers to perform path traversal attacks on Buffalo WSR-2533DHPL2 and WSR-2533DHP3 devices, leading to authentication bypass.

Affected Systems and Versions

Vendor: n/a
Affected Products: Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3
Vulnerable Versions: WSR-2533DHPL2 <= 1.02, WSR-2533DHP3 <= 1.24

Exploitation Mechanism

Attackers exploit the path traversal vulnerability in the web interfaces of the affected firmware versions to bypass authentication and gain unauthorized access.

Mitigation and Prevention

This section outlines the steps to mitigate and prevent exploitation of CVE-2021-20090.

Immediate Steps to Take

Update the firmware to the latest version provided by the vendor.
Implement network-level controls and restrictions to limit unauthorized access.

Long-Term Security Practices

Regularly monitor for security updates and patches from the manufacturer.
Conduct periodic security assessments to identify and address vulnerabilities proactively.

Patching and Updates

Apply security patches and updates released by Buffalo for the WSR-2533DHPL2 and WSR-2533DHP3 devices to eliminate the path traversal vulnerability.