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CVE-2021-20090: Arcadyan Buffalo Firmware Path Traversal Vulnerability

criticalknown exploitedpublic exploitCVE-2021-20090
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Arcadyanproduct: Buffalo FirmwarePath traversal
What
A path traversal vulnerability allows unauthenticated attackers to access sensitive information.
Who is affected
Users of routers with Arcadyan Buffalo firmware.
Urgency
Immediate action is required due to active exploitation and critical severity.
Action
Update the firmware of affected routers.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-20090coverage & exploitation statusNVD · CVE.org

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