{"cve":"CVE-2021-20090","nvd":{"published":"2021-04-29T15:15:10.630","modified":"2026-06-17T03:33:15.487","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-22"],"references":["https://www.kb.cert.org/vuls/id/914124","https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/","https://www.tenable.com/security/research/tra-2021-13","https://www.kb.cert.org/vuls/id/914124","https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/"],"products":["buffalo:wsr-2533dhp3-bk_firmware","buffalo:wsr-2533dhpl2-bk_firmware"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-20090","score":0.99982,"percentile":0.99982,"date":"2026-10-31"},"kev":{"cve":"CVE-2021-20090","date_added":"2021-11-03","due_date":"2021-11-17","vendor":"Arcadyan","product":"Buffalo Firmware","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}