CVE-2021-20090

9.8 CRITICAL CISA KEV - Actively Exploited

Published: April 29, 2021 Modified: November 03, 2025

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://www.kb.cert.org/vuls/id/914124

Source: vulnreport@tenable.com

Third Party Advisory US Government Resource

https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/

Source: vulnreport@tenable.com

Exploit Third Party Advisory

https://www.tenable.com/security/research/tra-2021-13

Source: vulnreport@tenable.com

Exploit Third Party Advisory

https://www.kb.cert.org/vuls/id/914124

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory US Government Resource

https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Third Party Advisory

https://www.tenable.com/security/research/tra-2021-13

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit Third Party Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20090

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

7 reference(s) from NVD

Quick Stats

CVSS v3 Score

9.8 / 10.0

EPSS (Exploit Probability)

94.4%

100th percentile

Exploitation Status

Actively Exploited

Remediation due: 2021-11-17

Weaknesses (CWE)

CWE-22 CWE-22

Affected Vendors

buffalo

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