{"id":"CVE-2016-4644","aliases":["EUVD-2016-5630","GHSA-p9wg-r6p8-r2pv"],"status":"published","title":"In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update...","description":"In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.","severity":{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01332,"percentile":0.71309,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200"],"published":"2019-01-11T18:00:00Z","modified":"2026-06-17T00:47:57Z","products":[{"vendor":"apple","product":"apple_tv"},{"vendor":"apple","product":"iphone_os"},{"vendor":"apple","product":"mac_os"}],"references":[{"url":"https://support.apple.com/HT206902","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://support.apple.com/HT206903","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://support.apple.com/HT206905","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-4644"},{"url":"https://github.com/advisories/GHSA-p9wg-r6p8-r2pv"}],"sources":{"cve":[{"id":"CVE-2016-4644","description":"In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.","status":"published","published":"2019-01-11T18:00:00Z","modified":"2024-08-06T00:39:25.4Z","updated_at":"2026-11-02T14:33:34.815789Z"}],"euvd":[{"id":"EUVD-2016-5630","description":"In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.","status":"published","published":"2019-01-11T18:00:00Z","modified":"2024-08-06T00:39:25Z","updated_at":"2026-11-03T02:22:45.348111Z"}],"ghsa":[{"id":"GHSA-p9wg-r6p8-r2pv","title":"In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update...","description":"In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.","status":"published","published":"2022-05-14T01:40:03Z","modified":"2023-02-02T05:04:28Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:51:52.696148Z"}],"nvd":[{"id":"CVE-2016-4644","description":"In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.","status":"published","published":"2019-01-11T18:29:00.453Z","modified":"2026-06-17T00:47:57.18Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:03:39.621168Z"}]}}