{"id":"CVE-2021-21539","aliases":["EUVD-2021-8811","GHSA-mvg3-9cx3-qjv5"],"status":"published","title":"Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race...","description":"Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race condition vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to gain elevated privileges when a user with higher privileges is simultaneously accessing iDRAC through the web interface.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00616,"percentile":0.50034,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-367"],"published":"2021-04-30T20:55:18Z","modified":"2026-06-17T03:35:44Z","products":[{"vendor":"dell","product":"idrac9_firmware"},{"vendor":"dell","product":"integrated dell remote access controller (idrac)"}],"references":[{"url":"https://www.dell.com/support/kbdoc/000185293","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21539"},{"url":"https://github.com/advisories/GHSA-mvg3-9cx3-qjv5"}],"sources":{"cve":[{"id":"CVE-2021-21539","description":"Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race condition vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to gain elevated privileges when a user with higher privileges is simultaneously accessing iDRAC through the web interface.","status":"published","published":"2021-04-30T20:55:18.417Z","modified":"2024-09-16T16:58:47.474Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:L","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:00.137099Z"}],"euvd":[{"id":"EUVD-2021-8811","description":"Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race condition vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to gain elevated privileges when a user with higher privileges is simultaneously accessing iDRAC through the web interface.","status":"published","published":"2021-04-30T20:55:18Z","modified":"2024-09-16T16:58:47Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:L","level":"medium"}],"updated_at":"2026-11-03T00:55:46.200652Z"}],"ghsa":[{"id":"GHSA-mvg3-9cx3-qjv5","title":"Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race...","description":"Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race condition vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to gain elevated privileges when a user with higher privileges is simultaneously accessing iDRAC through the web interface.","status":"published","published":"2022-05-24T17:49:22Z","modified":"2023-01-29T05:06:35Z","cwes":["CWE-367"],"updated_at":"2026-11-02T14:46:03.455343Z"}],"nvd":[{"id":"CVE-2021-21539","description":"Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race condition vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to gain elevated privileges when a user with higher privileges is simultaneously accessing iDRAC through the web interface.","status":"published","published":"2021-04-30T21:15:08.707Z","modified":"2026-06-17T03:35:44.497Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.6,"vector":"AV:N/AC:H/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:06:52.81233Z"}]}}