{"cve_id":"CVE-2020-6819","published":"2020-04-24T16:15:13.370000+00:00","last_modified":"2026-06-17T03:23:51.823000+00:00","vuln_status":"Analyzed","description":"Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","base_score":8.1,"base_severity":"HIGH","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-362","CWE-416"],"in_kev":true,"kev_date_added":"2021-11-03","kev_ransomware":false,"epss_score":0.03039,"epss_percentile":0.87514,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"PRIV","caps":["CODE_EXEC","PRIV_GAIN"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T09:17:16.024437+00:00","first_seen":"2020-04-24T16:15:13.370000+00:00","kev_first_seen":"2021-11-03T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["mozilla"],"products":["firefox","thunderbird"],"affected":[{"vendor":"mozilla","product":"firefox","ranges":["< 68.6.1","< 74.0.1"]},{"vendor":"mozilla","product":"thunderbird","ranges":["< 68.7.0"]}]}