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CVE-2021-20090

9.8 · CRITICALActively Exploited

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 bypa…

Published Apr 29, 2021CWE-22EPSS 99.98%

Overview

CVE-2021-20090 is a critical-severity vulnerability. It was published on April 29, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.kb.cert.org/vuls/id/914124Refwww.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/Refwww.tenable.com/security/research/tra-2021-13Refwww.kb.cert.org/vuls/id/914124Refwww.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/Refwww.tenable.com/security/research/tra-2021-13CISAwww.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20090

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20090?

CVE-2021-20090 is a critical-severity vulnerability. It was published on April 29, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2021-20090?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-20090?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-20090?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20090 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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