CVE-2021-20090

Timeline

Detection, updates, and resolution for this record.

1. Apr 29, 2021 · Catalog

   Detected

   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.

2. Nov 3, 2021 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Nov 17, 2021 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   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.

Affected

• cpe buffalo/wsr-2533dhp3-bk firmwareversion unspecified
• cpe buffalo/wsr-2533dhpl2-bk firmwareversion unspecified
• vendor Arcadyan Buffalo Firmwareversion unspecified

Sources

• CISA KEVCVE-2021-20090

  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.

  cisa.gov
• CVE.orgCVE-2021-20090

  Official CVE identifier

  cve.org
• FIRST EPSSCVE-2021-20090

  30-day exploitation probability 100.0%

  first.org
• NIST NVDCVE-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.

  nvd.nist.gov

References

• CISA note · nvd.nist.gov
• US Government Resource · cisa.gov
• Third Party Advisory · kb.cert.org
• Exploit · secpod.com
• Exploit · tenable.com