CVE-2021-20090

critical

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.

References

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

https://www.tenable.com/blog/cisa-top-20-cves-exploited-peoples-republic-of-china-state-sponsored-actors-aa22-279a

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

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

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

Details

Source: Mitre, NVD

Published: 2021-04-29

Updated: 2025-10-22

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

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

Severity: Critical

EPSS

EPSS: 0.94401

Detections

Analytics