Is CVE-2021-20090 actively exploited?

CVE-2021-20090 has no public evidence of in-the-wild exploitation as of 2025-11-03.

What is the CVSS score for CVE-2021-20090?

CVE-2021-20090 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-20090?

Patch guidance is available from buffalo security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-20090.

Fix CVE-2021-20090 - CRITICAL

Q: Which products are affected by CVE-2021-20090?

2 products: buffalo wsr-2533dhpl2-bk firmware, buffalo wsr-2533dhp3-bk firmware.

Description

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-22 · Path Traversal CWE-22 · Path Traversal

Metadata

Primary Vendor: BUFFALO
Published: 4/29/2021
Last Modified: 11/3/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2021-20090

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary