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.

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

7.5 HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS

99.98% chance of exploitation in the next 30 days, 100th percentile

CISA KEV

added 2021-11-03

Nuclei

critical · CWE-22

Published

2021-04-29

Updated

2025-10-21

Proof-of-concept exploits (2)

• https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/
• https://www.tenable.com/security/research/tra-2021-13

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-20090.yaml

References

• CVE Record
• NVD entry

Related

• CVE-2021-20089
• CVE-2021-20091
• CVE-2021-20088
• CVE-2021-20092
• CVE-2021-20087
• CVE-2021-20093