Buffalo Routers Multiple Vulnerabilities (TRA-2021-13)

critical Nessus Plugin ID 152198


The remote device is affected by multiple vulnerabilities.


Nessus was able to determine that the remote Buffalo device is affected by multiple vulnerabilities:
- A path traversal vulnerability in the web interfaces of certain Buffalo router models could allow unauthenticated remote attackers to bypass authentication. (CVE-2021-20090)

- The web interfaces of certain Buffalo router models do not properly sanitize user input. An authenticated remote attacker could leverage this vulnerability to alter device configuration, potentially gaining remote code execution. (CVE-2021-20091)

- The web interfaces of certain Buffalo router models do not properly restrict access to sensitive information from an unauthorized actor. (CVE-2021-20092)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Vendor has released fixes for certain models. Contact vendor for more information.

See Also


Plugin Details

Severity: Critical

ID: 152198

File Name: buffalo_wsr_cve_2021_20090.nasl

Version: 1.5

Type: remote

Family: Misc.

Published: 8/4/2021

Updated: 1/20/2022

Risk Information


Risk Factor: High

Score: 8.4


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: E:H/RL:OF/RC:C

CVSS Score Source: CVE-2021-20090


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: x-cpe:/a:buffalo:buffalo

Required KB Items: installed_sw/Buffalo WWW

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/26/2021

Vulnerability Publication Date: 4/26/2021

CISA Known Exploited Dates: 11/17/2021

Reference Information

CVE: CVE-2021-20090, CVE-2021-20091, CVE-2021-20092