CVE-2021-20090

State: Published
Severity: 9.8 Critical
Published: Apr 29, 2021
Updated: Oct 21, 2025
Reserved: Dec 17, 2020

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Products

Product	Versions
Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3n/a	WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24Affected

References

https://www.tenable.com/security/research/tra-2021-13
VU#914124third-party-advisory
https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20090government-resource

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