VulnerabilityAnalyzed
CVE-2021-20090
Arcadyan Buffalo Firmware Path Traversal Vulnerability
KEVCRITICAL 9.8EPSS 100.0%
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 99.98% probability · 100th percentile
- CISA KEV
- Listed 3 November 2021 · due 17 November 2021
- Weakness
- CWE-22
- Affected
- buffalo/wsr-2533dhpl2-bk firmware · buffalo/wsr-2533dhp3-bk firmware
- Source
- vulnreport@tenable.com
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-20090
References
- https://www.kb.cert.org/vuls/id/914124Third Party Advisory, US Government Resource
- https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/Exploit, Third Party Advisory
- https://www.tenable.com/security/research/tra-2021-13Exploit, Third Party Advisory
- https://www.kb.cert.org/vuls/id/914124Third Party Advisory, US Government Resource
- https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/Exploit, Third Party Advisory
- https://www.tenable.com/security/research/tra-2021-13Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20090US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.