{"id":"CVE-2023-4001","title":"Grub2: bypass the grub password protection feature","summary":"An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of atta…","severity":"medium","cvss":6.8,"cvssVector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-290"],"vendor":"Red Hat","product":"grub2","affected":["grub2 (all versions)","grub2 (all versions)","grub2 (all versions)","grub2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2024-01-22T19:43:22.277849Z"},"published":"2024-01-15","updated":"2026-11-07","sourceUpdated":"2026-11-07T11:32:44.559Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-4001","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:0437","label":"RHSA-2024:0437"},{"url":"https://access.redhat.com/errata/RHSA-2024:0456","label":"RHSA-2024:0456"},{"url":"https://access.redhat.com/errata/RHSA-2024:0468","label":"RHSA-2024:0468"},{"url":"https://access.redhat.com/security/cve/CVE-2023-4001"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2224951","label":"RHBZ#2224951"},{"url":"https://dfir.ru/2024/01/15/cve-2023-4001-a-vulnerability-in-the-downstream-grub-boot-manager/"}],"tags":["cve.org"],"epss":0.00542,"epssPercentile":0.45787,"ingestedAt":"2026-11-07T12:16:41.107Z","slug":"CVE-2023-4001","body":"## Overview\n\nAn authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the \"/boot/\" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.\n\n## Affected\n\n- `grub2 (all versions)`\n- `grub2 (all versions)`\n- `grub2 (all versions)`\n- `grub2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":38,"depthScoreParts":{"impact":37.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}