{"id":"CVE-2021-4128","aliases":["EUVD-2021-34002","GHSA-qx74-qh3q-h8rj"],"status":"published","title":"When transitioning in and out of fullscreen mode, a graphics object was not correctly protected;...","description":"When transitioning in and out of fullscreen mode, a graphics object was not correctly protected; resulting in memory corruption and a potentially exploitable crash.\u003cbr\u003e*This bug only affects Firefox on MacOS. Other operating systems are unaffected.*. This vulnerability affects Firefox \u003c 95.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00575,"percentile":0.4778,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2022-12-22T00:00:00Z","modified":"2026-06-17T04:19:05Z","products":[{"vendor":"mozilla","product":"firefox"}],"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-52/","tags":["x_transferred","Vendor Advisory"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1735852","tags":["x_transferred","Exploit","Issue Tracking","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-4128"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-52"},{"url":"https://github.com/advisories/GHSA-qx74-qh3q-h8rj"}],"sources":{"cve":[{"id":"CVE-2021-4128","description":"When transitioning in and out of fullscreen mode, a graphics object was not correctly protected; resulting in memory corruption and a potentially exploitable crash.\u003cbr\u003e*This bug only affects Firefox on MacOS. Other operating systems are unaffected.*. This vulnerability affects Firefox \u003c 95.","status":"published","published":"2022-12-22T00:00:00Z","modified":"2025-04-16T15:58:19.476Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"adp"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:33:07.697752Z"}],"euvd":[{"id":"EUVD-2021-34002","description":"When transitioning in and out of fullscreen mode, a graphics object was not correctly protected; resulting in memory corruption and a potentially exploitable crash.\u003cbr\u003e*This bug only affects Firefox on MacOS. Other operating systems are unaffected.*. This vulnerability affects Firefox \u003c 95.","status":"published","published":"2022-12-22T00:00:00Z","modified":"2025-04-16T15:58:19Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T20:52:24.837818Z"}],"ghsa":[{"id":"GHSA-qx74-qh3q-h8rj","title":"When transitioning in and out of fullscreen mode, a graphics object was not correctly protected;...","description":"When transitioning in and out of fullscreen mode, a graphics object was not correctly protected; resulting in memory corruption and a potentially exploitable crash.\u003cbr\u003e*This bug only affects Firefox on MacOS. Other operating systems are unaffected.*. This vulnerability affects Firefox \u003c 95.","status":"published","published":"2022-12-22T21:30:31Z","modified":"2025-04-16T18:32:40Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:01:35.927372Z"}],"nvd":[{"id":"CVE-2021-4128","description":"When transitioning in and out of fullscreen mode, a graphics object was not correctly protected; resulting in memory corruption and a potentially exploitable crash.\u003cbr\u003e*This bug only affects Firefox on MacOS. Other operating systems are unaffected.*. This vulnerability affects Firefox \u003c 95.","status":"published","published":"2022-12-22T20:15:11.937Z","modified":"2026-06-17T04:19:05.007Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:07:07.323379Z"}]}}