CVE-2023-4001: fedoraproject fedora Authentication Bypass by Spoofing
Vulnerability summary
CVE-2023-4001 is a medium (CVSS 6.8) Authentication Bypass by Spoofing vulnerability in fedoraproject fedora. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 15-01-2024PublishedVulnerability first disclosed.
- 20-11-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · Red hatEcosystem advisory · calculated6.8MediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated6.8MediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST6.8MediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.54%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
0.00 pp
From 0.54% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Redhat24 products
- enterprise_linux9.0
- grub2< 1:2.06-27.el9_0.16 | < 1:2.06-61.el9_2.2 | < 1:2.06-70.el9_3.2
- grub2-common< 1:2.06-27.el9_0.16 | < 1:2.06-61.el9_2.2 | < 1:2.06-70.el9_3.2
- grub2-debuginfo< 1:2.06-27.el9_0.16 | < 1:2.06-61.el9_2.2 | < 1:2.06-70.el9_3.2
- grub2-debugsource< 1:2.06-27.el9_0.16 | < 1:2.06-61.el9_2.2 | < 1:2.06-70.el9_3.2
Fedoraproject1 product
- fedoraEOL38 | 39
Gnu1 product
- grub2na
Ubuntu1 product
- grub2-signedAll versions (No fix recorded)
4 vendors · 27 products
References
18 links- dfir.ru/2024/01/15/cve-2023-4001-a-vulnerability-in-the-downstream-grub-boot-manager/ARTICLEThird Party Advisory
- www.openwall.com/lists/oss-security/2024/01/15/3X Transferred
- lists.fedoraproject.org/archives/…X Transferred
- lists.fedoraproject.org/archives/…X Transferred
- security.netapp.com/advisory/ntap-20240216-0006/X Transferred
