{"id":"CVE-2023-4693","title":"An out-of-bounds read flaw was found on grub2's NTFS filesystem driver","summary":"An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allo…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N","cwe":["CWE-125","CWE-125"],"vendor":"gnu","product":"grub2","affected":["grub2 < 2.12","enterprise_linux = 8.0","enterprise_linux = 9.0"],"patched":["grub2 2.12"],"published":"2023-10-25","updated":"2026-07-21","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-4693","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:2456","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:3184","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2023-4693","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2238343","label":"secalert@redhat.com"},{"url":"https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/","label":"secalert@redhat.com"},{"url":"https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html","label":"secalert@redhat.com"},{"url":"https://seclists.org/oss-sec/2023/q4/37","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2024:2456","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2024:3184","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/security/cve/CVE-2023-4693","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2238343","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00007.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FUU42E7CPYLATXOYVYNW6YTXXULAOV6L/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OIRJ5UZRXX2KLR4IKBJEQUNGOCXMMDLY/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PERFILCHFEUGG3OAMC6W55P6DDIBZK4Q/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://seclists.org/oss-sec/2023/q4/37","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202311-14","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20231208-0002/","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00496,"epssPercentile":0.41596,"ingestedAt":"2026-07-21T06:47:32.942Z","slug":"CVE-2023-4693","body":"## Overview\n\nAn out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk.\n\n## Affected\n\n- `grub2 < 2.12`\n- `enterprise_linux = 8.0`\n- `enterprise_linux = 9.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `grub2 2.12`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}