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 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.
総合評価: CVE-2023-4001 は中リスク（42.1/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.54%、41 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.04% | 0.54% | +0.51% |
| 2 | 2025-11-21 | 0.82% | 0.04% | -0.79% |
| 3 | 2025-11-18 | — | 0.82% | — |
EPSS の全履歴 （全 9 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 6.8 | 3.1 | MEDIUM |
|
0.9 | 5.9 | [email protected] |
| 6.8 | 3.1 | MEDIUM |
|
0.9 | 5.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2023-4001 unimportant priority: Debian including 1 source packages (grub2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2023-4001 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2023-4001 |
suse
|
medium | CVE-2023-4001 severity moderate: SUSE including 10 source package names (grub2-common-2.06-70.el9_3.2, grub2-efi-x64-2.06-70.el9_3.2, …), 10 product×package rows across 1 product lines (SUSE Liberty Linux 9): Fixed 10. | https://www.suse.com/security/cve/CVE-2023-4001/ |
ubuntu
|
medium | CVE-2023-4001 medium priority: Ubuntu including 3 source packages (grub2, grub2-signed, grub2-unsigned), 30 status rows across 10 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, trusty, upstream, xenial): not-affected 28, ignored 2. | https://ubuntu.com/security/CVE-2023-4001 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| gnu | grub2 | — | cpe:2.3:a:gnu:grub2:-:*:*:*:*:*:*:* |
| redhat | enterprise_linux | 9.0 | cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* |
| fedoraproject | fedora | 38 | cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* |
| fedoraproject | fedora | 39 | cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* |