Known Exploited Vulnerability
9.8
CRITICAL
CVE-2021-20090
Arcadyan Buffalo Firmware Path Traversal Vulnerabi - [Actively Exploited]
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.

INFO

Published Date :

April 29, 2021, 3:15 p.m.

Last Modified :

July 25, 2024, 5:32 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

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.

Required Action :

Apply updates per vendor instructions.

Public PoC/Exploit Available at Github

CVE-2021-20090 has a 8 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-20090 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Buffalo wsr-2533dhpl2-bk_firmware
2 Buffalo wsr-2533dhp3-bk_firmware
3 Buffalo wsr-2533dhpl2-bk
4 Buffalo wsr-2533dhp3-bk
: Total Affected Vendor : 1 | Products : 4
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-20090.

URL Resource
https://www.kb.cert.org/vuls/id/914124 Third Party Advisory US Government Resource
https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/ Exploit Third Party Advisory
https://www.tenable.com/security/research/tra-2021-13 Exploit Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
DinoBytes/RVASec-2024-Consumer-Routers-Still-Suck

Slides and other reference material for RVASec 2024 presentation

Updated: 2 months, 4 weeks ago
4 stars 0 fork 0 watcher
Born at : May 31, 2024, 8:23 p.m. This repo has been linked 5 different CVEs too.
Profile Photo
d4n-sec/d4n-sec.github.io

None

CSS HTML JavaScript

Updated: 7 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Feb. 2, 2024, 2:11 p.m. This repo has been linked 494 different CVEs too.
Profile Photo
ArrestX/--POC

poc集合(持续更新ing)

Updated: 4 months, 1 week ago
4 stars 0 fork 0 watcher
Born at : July 30, 2023, 1:30 a.m. This repo has been linked 154 different CVEs too.
Profile Photo
0day404/vulnerability-poc

A Common Vulnerability PoC Knowledge Base一个普遍漏洞POC知识库

vulnerability

Updated: 2 months ago
17 stars 6 fork 6 watcher
Born at : June 24, 2023, 3:12 p.m. This repo has been linked 232 different CVEs too.
Profile Photo
34zY/APT-Backpack

cve-2019-11510, cve-2019-19781, cve-2020-5902,               cve-2021-1497, cve-2021-20090, cve-2021-22006, cve-2021-22205, cve-2021-26084, cve-2021-26855, cve-2021-26857, cve-2021–26857, cve-2021–26858, cve-2021–26865

Updated: 7 months, 4 weeks ago
2 stars 1 fork 1 watcher
Born at : Dec. 13, 2022, 8:41 a.m. This repo has been linked 21 different CVEs too.
Profile Photo
Ostorlab/KEV

Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.

cisa-kev vulnerability 0day cisa exploits

Updated: 1 week, 4 days ago
516 stars 32 fork 32 watcher
Born at : April 19, 2022, 8:58 a.m. This repo has been linked 1181 different CVEs too.
Profile Photo
Threekiii/Awesome-POC

一个漏洞POC知识库 目前数量 1000+

poc

Updated: 1 week, 5 days ago
3417 stars 682 fork 682 watcher
Born at : Feb. 20, 2022, 6:43 a.m. This repo has been linked 405 different CVEs too.
Profile Photo
ARPSyndicate/kenzer-templates

essential templates for kenzer [DEPRECATED]

kenzer vulnerabilities kenzer-templates arpsyndicate

Python Shell Ruby

Updated: 1 month ago
106 stars 32 fork 32 watcher
Born at : Sept. 18, 2020, 9:03 p.m. This repo has been linked 1653 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-20090 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-20090 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Modified Analysis by [email protected]

    Jul. 25, 2024

    Action Type Old Value New Value
    Changed Reference Type https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/ No Types Assigned https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/ Exploit, Third Party Advisory
    Changed CPE Configuration AND OR cpe:2.3:h:buffalo:wsr-2533dhpl2-bk:-:*:*:*:*:*:*:* OR *cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.02 AND OR *cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.02 OR cpe:2.3:h:buffalo:wsr-2533dhpl2-bk:-:*:*:*:*:*:*:*
    Changed CPE Configuration AND OR cpe:2.3:h:buffalo:wsr-2533dhp3-bk:-:*:*:*:*:*:*:* OR *cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.24 AND OR *cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.24 OR cpe:2.3:h:buffalo:wsr-2533dhp3-bk:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Oct. 18, 2023

    Action Type Old Value New Value
    Added Reference https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/ [No Types Assigned]
  • Modified Analysis by [email protected]

    Apr. 26, 2022

    Action Type Old Value New Value
    Changed Reference Type https://www.kb.cert.org/vuls/id/914124 No Types Assigned https://www.kb.cert.org/vuls/id/914124 Third Party Advisory, US Government Resource
    Changed Reference Type https://www.tenable.com/security/research/tra-2021-13 Third Party Advisory https://www.tenable.com/security/research/tra-2021-13 Exploit, Third Party Advisory
  • CVE Modified by [email protected]

    Jul. 20, 2021

    Action Type Old Value New Value
    Added Reference https://www.kb.cert.org/vuls/id/914124 [No Types Assigned]
  • Initial Analysis by [email protected]

    May. 08, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://www.tenable.com/security/research/tra-2021-13 No Types Assigned https://www.tenable.com/security/research/tra-2021-13 Third Party Advisory
    Added CWE NIST CWE-22
    Added CPE Configuration AND OR *cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.02 OR cpe:2.3:h:buffalo:wsr-2533dhpl2-bk:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.24 OR cpe:2.3:h:buffalo:wsr-2533dhp3-bk:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-20090 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-20090 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

97.22 }} -0.05%

score

0.99861

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: