{"cve_id":"CVE-2021-3199","published":"2021-01-26T18:16:28.507000+00:00","last_modified":"2026-10-09T14:20:47.350000+00:00","vuln_status":"Analyzed","description":"Directory traversal with remote code execution can occur in /upload in ONLYOFFICE Document Server before 5.6.3, when JWT is used, via a /.. sequence in an image upload parameter.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","base_score":9.8,"base_severity":"CRITICAL","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-22"],"in_kev":true,"kev_date_added":"2026-10-08","kev_ransomware":false,"epss_score":0.30244,"epss_percentile":0.98221,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["CODE_EXEC","INFO_DISCLOSURE"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-10-10T03:15:44.797892+00:00","first_seen":"2021-01-26T18:16:28.507000+00:00","kev_first_seen":"2026-10-09T03:18:30.714610+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":"2026-10-12T03:21:32.593352+00:00","vendors":["onlyoffice"],"products":["document_server"],"affected":[{"vendor":"onlyoffice","product":"document_server","ranges":["< 5.6.3"]}]}