{"id":"CVE-2021-30738","aliases":["EUVD-2021-17655","GHSA-r24w-f52g-qphg"],"status":"published","title":"A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS...","description":"A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Mojave. An issue with path validation logic for hardlinks was addressed with improved path sanitization.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00305,"percentile":0.23638,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-09-08T13:43:48Z","modified":"2026-06-17T03:50:47Z","products":[{"vendor":"apple","product":"mac_os_x"},{"vendor":"apple","product":"macos"}],"references":[{"url":"https://support.apple.com/en-us/HT212529","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://support.apple.com/en-us/HT212531","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-30738"},{"url":"https://github.com/advisories/GHSA-r24w-f52g-qphg"}],"sources":{"cve":[{"id":"CVE-2021-30738","description":"A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Mojave. An issue with path validation logic for hardlinks was addressed with improved path sanitization.","status":"published","published":"2021-09-08T13:43:48Z","modified":"2024-08-03T22:40:32.154Z","updated_at":"2026-11-02T14:33:01.852999Z"}],"euvd":[{"id":"EUVD-2021-17655","description":"A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Mojave. An issue with path validation logic for hardlinks was addressed with improved path sanitization.","status":"published","published":"2021-09-08T13:43:48Z","modified":"2024-08-03T22:40:32Z","updated_at":"2026-11-03T03:24:41.017854Z"}],"ghsa":[{"id":"GHSA-r24w-f52g-qphg","title":"A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS...","description":"A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Mojave. An issue with path validation logic for hardlinks was addressed with improved path sanitization.","status":"published","published":"2022-05-24T19:13:48Z","modified":"2023-01-30T05:02:07Z","updated_at":"2026-11-02T14:46:34.16886Z"}],"nvd":[{"id":"CVE-2021-30738","description":"A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Mojave. An issue with path validation logic for hardlinks was addressed with improved path sanitization.","status":"published","published":"2021-09-08T14:15:09.38Z","modified":"2026-06-17T03:50:47.463Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:P/A:N","level":"low","assessor":"primary"}],"updated_at":"2026-11-02T14:06:58.05696Z"}]}}