{"id":"CVE-2024-20397","aliases":["EUVD-2024-18112","GHSA-p5rq-7r6m-x7rf"],"status":"published","title":"Cisco NX-OS Software Image Verification Bypass Vulnerability","description":"A vulnerability in the bootloader of Cisco NX-OS Software could allow an unauthenticated attacker with physical access to an affected device, or an authenticated, local attacker with administrative credentials, to bypass NX-OS image signature verification.\u0026nbsp;\r\n\r\nThis vulnerability is due to insecure bootloader settings. An attacker could exploit this vulnerability by executing a series of bootloader commands. A successful exploit could allow the attacker to bypass NX-OS image signature verification and load unverified software.","severity":{"version":"3.1","score":5.2,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00298,"percentile":0.22658,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-284"],"published":"2024-12-04T16:13:13Z","modified":"2026-06-17T07:06:55Z","products":[{"vendor":"cisco","product":"cisco nx-os software"},{"vendor":"cisco","product":"cisco nx-os system software in aci mode"},{"vendor":"cisco","product":"cisco unified computing system (managed)"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-image-sig-bypas-pQDRQvjL"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-20397"},{"url":"https://github.com/advisories/GHSA-p5rq-7r6m-x7rf"}],"sources":{"cve":[{"id":"CVE-2024-20397","title":"Cisco NX-OS Software Image Verification Bypass Vulnerability","description":"A vulnerability in the bootloader of Cisco NX-OS Software could allow an unauthenticated attacker with physical access to an affected device, or an authenticated, local attacker with administrative credentials, to bypass NX-OS image signature verification.\u0026nbsp;\r\n\r\nThis vulnerability is due to insecure bootloader settings. An attacker could exploit this vulnerability by executing a series of bootloader commands. A successful exploit could allow the attacker to bypass NX-OS image signature verification and load unverified software.","status":"published","published":"2024-12-04T16:13:13.89Z","modified":"2025-04-08T14:29:18.43Z","cvss":[{"version":"3.1","score":5.2,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:33:56.868512Z"}],"euvd":[{"id":"EUVD-2024-18112","description":"A vulnerability in the bootloader of Cisco NX-OS Software could allow an unauthenticated attacker with physical access to an affected device, or an authenticated, local attacker with administrative credentials, to bypass NX-OS image signature verification.\u0026nbsp;\r\n\r\nThis vulnerability is due to insecure bootloader settings. An attacker could exploit this vulnerability by executing a series of bootloader commands. A successful exploit could allow the attacker to bypass NX-OS image signature verification and load unverified software.","status":"published","published":"2024-12-04T16:13:13Z","modified":"2025-04-08T14:29:18Z","cvss":[{"version":"3.1","score":5.2,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T20:52:40.053562Z"}],"ghsa":[{"id":"GHSA-p5rq-7r6m-x7rf","title":"A vulnerability in the bootloader of Cisco NX-OS Software could allow an unauthenticated attacker...","description":"A vulnerability in the bootloader of Cisco NX-OS Software could allow an unauthenticated attacker with physical access to an affected device, or an authenticated, local attacker with administrative credentials, to bypass NX-OS image signature verification.\n\nThis vulnerability is due to insecure bootloader settings. An attacker could exploit this vulnerability by executing a series of bootloader commands. A successful exploit could allow the attacker to bypass NX-OS image signature verification and load unverified software.","status":"published","published":"2024-12-04T18:32:36Z","modified":"2024-12-04T18:32:43Z","cvss":[{"version":"3.1","score":5.2,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"medium"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:59:02.702846Z"}],"nvd":[{"id":"CVE-2024-20397","description":"A vulnerability in the bootloader of Cisco NX-OS Software could allow an unauthenticated attacker with physical access to an affected device, or an authenticated, local attacker with administrative credentials, to bypass NX-OS image signature verification.\u0026nbsp;\r\n\r\nThis vulnerability is due to insecure bootloader settings. An attacker could exploit this vulnerability by executing a series of bootloader commands. A successful exploit could allow the attacker to bypass NX-OS image signature verification and load unverified software.","status":"published","published":"2024-12-04T17:15:11.913Z","modified":"2026-06-17T07:06:55.63Z","cvss":[{"version":"3.1","score":5.2,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:10:38.973941Z"}]}}