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CVE-2021-20090

Known Exploited (CISA KEV)CRITICAL

9.8

CVSS Severity Score

EPSS Score34.4260%

EPSS Percentile96.30th

PublishedApr 29, 2021

Last ModifiedNov 3, 2025

Vulnerability 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.

Affected Platforms (CPE)

💻

Buffalo

Wsr 2533dhpl2 Bk Firmware

<= 1.02

💻

Buffalo

Wsr 2533dhp3 Bk Firmware

<= 1.24

References & Advisories

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

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

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

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

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

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

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

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