{"id":"CVE-2020-24721","aliases":["EUVD-2020-17432","GHSA-9pjj-6grx-8qjx"],"status":"published","title":"An issue was discovered in the GAEN (aka Google Apple Encounter Notification) protocol through...","description":"An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-09-29, as used in COVID-19 applications on Android and iOS. It allows a user to be put in a position where he or she can be coerced into proving or disproving an exposure notification, because of the persistent state of a private framework.","severity":{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:P/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00318,"percentile":0.25084,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2020-09-30T17:43:01Z","modified":"2026-06-17T03:06:02Z","products":[{"vendor":"apple","product":"exposure_notifications"},{"vendor":"google","product":"exposure_notifications"}],"references":[{"url":"https://blog.google/inside-google/company-announcements/update-exposure-notifications","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://github.com/minvws/nl-covid19-notification-app-coordination/blob/master/CVEs/CVE-2020-24721.txt","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://seclists.org/fulldisclosure/2020/Sep/53","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Mailing List","Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/159419/Corona-Exposure-Notifications-API-Data-Leakage.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-24721"},{"url":"https://github.com/advisories/GHSA-9pjj-6grx-8qjx"}],"sources":{"cve":[{"id":"CVE-2020-24721","description":"An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-09-29, as used in COVID-19 applications on Android and iOS. It allows a user to be put in a position where he or she can be coerced into proving or disproving an exposure notification, because of the persistent state of a private framework.","status":"published","published":"2020-09-30T17:43:01Z","modified":"2024-08-04T15:19:09.329Z","updated_at":"2026-11-02T14:35:54.468882Z"}],"euvd":[{"id":"EUVD-2020-17432","description":"An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-09-29, as used in COVID-19 applications on Android and iOS. It allows a user to be put in a position where he or she can be coerced into proving or disproving an exposure notification, because of the persistent state of a private framework.","status":"published","published":"2020-09-30T17:43:01Z","modified":"2024-08-04T15:19:09Z","updated_at":"2026-11-03T03:07:19.210308Z"}],"ghsa":[{"id":"GHSA-9pjj-6grx-8qjx","title":"An issue was discovered in the GAEN (aka Google Apple Encounter Notification) protocol through...","description":"An issue was discovered in the GAEN (aka Google Apple Encounter Notification) protocol through 2020-08-27, as used in Corona applications on Android and iOS. It allows a user to be put in a position where he or she can be coerced into proving or dis-proving an encounter notification.","status":"published","published":"2022-05-24T17:29:50Z","modified":"2023-01-29T05:04:01Z","updated_at":"2026-11-02T14:45:27.507739Z"}],"nvd":[{"id":"CVE-2020-24721","description":"An issue was discovered in the GAEN (aka Google/Apple Exposure Notifications) protocol through 2020-09-29, as used in COVID-19 applications on Android and iOS. It allows a user to be put in a position where he or she can be coerced into proving or disproving an exposure notification, because of the persistent state of a private framework.","status":"published","published":"2020-09-30T18:15:25.193Z","modified":"2026-06-17T03:06:02.097Z","cvss":[{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:P/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":3.3,"vector":"AV:L/AC:M/Au:N/C:P/I:P/A:N","level":"low","assessor":"primary"}],"updated_at":"2026-11-02T14:06:17.70091Z"}]}}