CVE-2021-20090 : A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 fi

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.

Published 2021-04-29 15:15:11

Updated 2024-07-25 17:32:27

Source Tenable Network Security, Inc.

View at NVD, CVE.org

Vulnerability category: Directory traversal

Products affected by CVE-2021-20090

Buffalo » Wsr-2533dhpl2-bk Firmware
Versions up to, including, (<=) 1.02
cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Buffalo » Wsr-2533dhpl2-bk » Version: N/A
Buffalo » Wsr-2533dhp3-bk Firmware
Versions up to, including, (<=) 1.24
cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Buffalo » Wsr-2533dhp3-bk » Version: N/A

CVE-2021-20090 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:

Arcadyan Buffalo Firmware Path Traversal Vulnerability

CISA required action:

Apply updates per vendor instructions.

CISA description:

Arcadyan Buffalo firmware contains a path traversal vulnerability that could allow unauthenticated, remote attackers to bypass authentication and access sensitive information. This vulnerability affects multiple routers across several different vendors.

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2021-20090

Added on 2021-11-03 Action due date 2021-11-17

Exploit prediction scoring system (EPSS) score for CVE-2021-20090

EPSS FAQ

97.14%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 100 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20090

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-20090

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

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-20090

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

Routers & Modems Under Active Exploitation in Arcadyan Firmware
Exploit;Third Party Advisory
https://www.tenable.com/security/research/tra-2021-13

Multiple Vulnerabilities in Buffalo WSR-2533DHPL2 and WSR-2533DHP3 - Research Advisory | Tenable®
Exploit;Third Party Advisory

CVEs referencing this url
https://www.kb.cert.org/vuls/id/914124

VU#914124 - Arcadyan-based routers and modems vulnerable to authentication bypass
Third Party Advisory;US Government Resource