{"cve_id":"CVE-2021-1871","published":"2021-04-02T19:15:20.663000+00:00","last_modified":"2026-06-17T03:32:41.847000+00:00","vuln_status":"Analyzed","description":"A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..","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":[],"in_kev":true,"kev_date_added":"2021-11-03","kev_ransomware":false,"epss_score":0.07002,"epss_percentile":0.94166,"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":"medium","ingested_at":"2026-09-18T09:37:49.285398+00:00","first_seen":"2021-04-02T19:15:20.663000+00:00","kev_first_seen":"2021-11-03T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["apple","debian","fedoraproject"],"products":["debian_linux","fedora","ipados","iphone_os","mac_os_x","macos"],"affected":[{"vendor":"apple","product":"ipados","ranges":["< 14.4"]},{"vendor":"apple","product":"iphone_os","ranges":["< 14.4"]},{"vendor":"apple","product":"mac_os_x","ranges":["≥ 10.15 and < 10.15.7","10.15.7"]},{"vendor":"apple","product":"macos","ranges":["≥ 11.0.1 and < 11.2"]},{"vendor":"debian","product":"debian_linux","ranges":["10.0"]},{"vendor":"fedoraproject","product":"fedora","ranges":["33"]}]}