No exploitation reported

CVE-2023-4001

No exploitation reported by the sources we read.

Published2024-01-15
WeaknessCWE-290

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2024-01-1511:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-4001?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-4001?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
38.x	= 38	no fix published	NVD
39.x	= 39	no fix published	NVD

Gnu grub2

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Redhat enterprise linux

Branch	Affected	Fixed in	Source
9.0	= 9.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

grub2-toolsAlmaLinux:9all versions · fixed in 1:2.06-70.el9_3.2.alma.1and 14 other packages

Full record on NVD

Fix

Advisories and patches

bugzilla.redhat.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2024-01-22
OpenCVESSVC decisionnone—
CNACVSS 3.16.8read 2026-10-23
NVDCVSS 3.16.8read 2026-10-23
CNAweakness (CWE)CWE-290read 2026-10-23
NVDweakness (CWE)CWE-290read 2026-10-23
FIRST EPSSEPSS score0.5 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2024-01-15
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-4001?

Is CVE-2023-4001 actively exploited?

Active exploitation of CVE-2023-4001 has not been confirmed. Its EPSS score was 0.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-4001?

CVE-2023-4001 has a CVSS v3 base score of 6.8 (MEDIUM severity), with vector string CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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