{"id":"CVE-2021-29958","aliases":["EUVD-2021-16417","GHSA-5j3q-vmj5-h7fx"],"status":"published","title":"When a download was initiated, the client did not check whether it was in normal or private...","description":"When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode. This vulnerability affects Firefox for iOS \u003c 34.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00671,"percentile":0.52341,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-668","CWE-862"],"published":"2021-06-24T13:16:48Z","modified":"2026-06-17T03:48:30Z","products":[{"vendor":"mozilla","product":"firefox"},{"vendor":"mozilla","product":"firefox for ios"}],"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-25/","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1670127","tags":["x_refsource_MISC","x_transferred","Permissions Required","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29958"},{"url":"https://github.com/advisories/GHSA-5j3q-vmj5-h7fx"}],"sources":{"cve":[{"id":"CVE-2021-29958","description":"When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode. This vulnerability affects Firefox for iOS \u003c 34.","status":"published","published":"2021-06-24T13:16:48Z","modified":"2024-08-03T22:18:03.205Z","updated_at":"2026-11-02T14:33:06.32268Z"}],"euvd":[{"id":"EUVD-2021-16417","description":"When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode. This vulnerability affects Firefox for iOS \u003c 34.","status":"published","published":"2021-06-24T13:16:48Z","modified":"2024-08-03T22:18:03Z","updated_at":"2026-11-03T03:24:43.413555Z"}],"ghsa":[{"id":"GHSA-5j3q-vmj5-h7fx","title":"When a download was initiated, the client did not check whether it was in normal or private...","description":"When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode. This vulnerability affects Firefox for iOS \u003c 34.","status":"published","published":"2022-05-24T19:06:08Z","modified":"2023-01-27T05:03:19Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-668"],"updated_at":"2026-11-02T14:42:13.302487Z"}],"nvd":[{"id":"CVE-2021-29958","description":"When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode. This vulnerability affects Firefox for iOS \u003c 34.","status":"published","published":"2021-06-24T14:15:10.143Z","modified":"2026-06-17T03:48:30.66Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:06:54.892562Z"}]}}