CRITICAL CISA KEV

CVE-2021-20090

CVSS v3

9.8

CRITICAL

EPSS Score

94.4%

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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.

CISA Known Exploited Vulnerability

Date Added
11/3/2021
Patch Due Date
11/17/2021
Ransomware Use
Unknown

Technical details

Published
4/29/2021

Frequently asked questions

What is CVE-2021-20090?

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.

Is CVE-2021-20090 actively exploited?

Yes. CVE-2021-20090 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 11/17/2021.

What is the CVSS score for CVE-2021-20090?

CVE-2021-20090 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2021-20090 affecting your environment?

Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.

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