CVE-2021-20090

CISA description

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.

Notes & references

• https://nvd.nist.gov/vuln/detail/CVE-2021-20090

Where this lands in 800-53

Vulnerability data triggers these controls during assessment and continuous monitoring.

• RA-5 · Vulnerability Monitoring and Scanning
• SI-2 · Flaw Remediation
• CM-6 · Configuration Settings
• SI-7 · Software, Firmware, and Information Integrity
• CM-8 · System Component Inventory

External lookups

• NVD · CVE-2021-20090
• CVE.org · CVE-2021-20090
• CISA KEV catalog (canonical)