{"id":"CVE-2021-20487","aliases":["EUVD-2021-7905","GHSA-gwjp-78rh-pcgc"],"status":"published","title":"IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and...","description":"IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware bypassing the host firmware signature verification process.","severity":{"version":"3.0","score":8,"vector":"CVSS:3.0/AV:N/UI:N/I:H/AC:H/PR:H/S:C/A:H/C:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0068,"percentile":0.52702,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-347"],"published":"2021-05-26T16:20:17Z","modified":"2026-06-17T03:33:54Z","products":[{"vendor":"ibm","product":"power 9 systems"},{"vendor":"ibm","product":"power9_system_firmware"},{"vendor":"ibm","product":"scale-out_lc_system_firmware"}],"references":[{"url":"https://www.ibm.com/support/pages/node/6455911","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/197730","tags":["vdb-entry","x_refsource_XF","x_transferred","VDB Entry","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20487"},{"url":"https://github.com/advisories/GHSA-gwjp-78rh-pcgc"}],"sources":{"cve":[{"id":"CVE-2021-20487","description":"IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware bypassing the host firmware signature verification process.","status":"published","published":"2021-05-26T16:20:17.769Z","modified":"2024-09-16T18:33:23.529Z","cvss":[{"version":"3.0","score":8,"vector":"CVSS:3.0/AV:N/UI:N/I:H/AC:H/PR:H/S:C/A:H/C:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:32:55.905855Z"}],"euvd":[{"id":"EUVD-2021-7905","description":"IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware bypassing the host firmware signature verification process.","status":"published","published":"2021-05-26T16:20:17Z","modified":"2024-09-16T18:33:23Z","cvss":[{"version":"3.0","score":8,"vector":"CVSS:3.0/AV:N/UI:N/I:H/AC:H/PR:H/S:C/A:H/C:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-03T00:55:31.571078Z"}],"ghsa":[{"id":"GHSA-gwjp-78rh-pcgc","title":"IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and...","description":"IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware bypassing the host firmware signature verification process.","status":"published","published":"2022-05-24T19:03:20Z","modified":"2023-01-29T05:06:48Z","cwes":["CWE-347"],"updated_at":"2026-11-02T14:46:05.929333Z"}],"nvd":[{"id":"CVE-2021-20487","description":"IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware bypassing the host firmware signature verification process.","status":"published","published":"2021-05-26T17:15:14.26Z","modified":"2026-06-17T03:33:54.84Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.0","score":8,"vector":"CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:06:53.987491Z"}]}}