Critical severity · published Apr 29, 2021
CVE-2021-20090
Arcadyan Buffalo Firmware Path Traversal Vulnerability
In wildKEV
9.8
CVSS
100%
EPSS
Yes
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)100.0% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed Nov 3, 2021
Federal remediation dueNov 17, 2021
Ransomware campaign useNot known
Affected products
Which versions
BW
Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3 ·
WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24 · source: vendor
WF
Wsr-2533dhp3-bk Firmware · Buffalo
through 1.24 · source: NVD
WF
Wsr-2533dhpl2-bk Firmware · Buffalo
through 1.02 · source: NVD
BF
Buffalo Firmware · Arcadyan
All versions, or not specified · source: KEV
Affected product
BW
Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-20090
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-20090
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
www.tenable.com
https://www.tenable.com/security/research/tra-2021-13
third-party-advisory
https://www.kb.cert.org/vuls/id/914124
www.secpod.com
https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/