CVE-2021-20090
Arcadyan Buffalo Firmware Path Traversal Vulnerability
What is affected
| Vendor | Arcadyan |
|---|---|
| Product | Buffalo Firmware |
| Weakness | CWE-22 |
The vulnerability
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.
Required action
Apply updates per vendor instructions.
US federal civilian agencies were required to act by 17 November 2021 under BOD 22-01. The deadline is a compliance date, not a measure of severity — it says nothing about how dangerous the flaw is to anyone else.
Where this comes from
Every field on this page is taken from the CISA Known Exploited Vulnerabilities catalog, last synced 12 Nov 2026, 00:29. Nothing here is our own assessment. For the technical scoring, see the NVD record below.