{"cve_id":"CVE-2021-31166","published":"2021-05-11T19:15:09.300000+00:00","last_modified":"2026-06-17T03:51:21.910000+00:00","vuln_status":"Analyzed","description":"HTTP Protocol Stack Remote Code Execution Vulnerability","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-416"],"in_kev":true,"kev_date_added":"2022-04-06","kev_ransomware":false,"epss_score":0.99867,"epss_percentile":0.99963,"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"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T09:41:33.892865+00:00","first_seen":"2021-05-11T19:15:09.300000+00:00","kev_first_seen":"2022-04-06T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["microsoft"],"products":["windows_10_2004","windows_10_20h2","windows_server_2004","windows_server_20h2"],"affected":[{"vendor":"microsoft","product":"windows_10_2004","ranges":["< 10.0.19041.982"]},{"vendor":"microsoft","product":"windows_10_20h2","ranges":["< 10.0.19042.982"]},{"vendor":"microsoft","product":"windows_server_2004","ranges":["< 10.0.19041.982"]},{"vendor":"microsoft","product":"windows_server_20h2","ranges":["< 10.0.19042.982"]}]}