CVE-2023-4692

Medium

Elevated severity or exploit probability.

CVSS base

7.5 HIGH

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS — probability of exploitation (30 days)

0.5%

44.3th percentile

CISA KEV

Not listed

Weakness / dates

CWE-787

Published 2023-10-25 · modified 2026-07-21

CVSS breakdown

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector	L	Local
Attack Complexity	H	High
Privileges Required	H	High
User Interaction	N	None
Scope	C	Changed
Confidentiality	H	High
Integrity	H	High
Availability	H	High

Timeline

2023-10-25 — Published (NVD)
2026-07-21 — Last modified (NVD)

Description

An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved.

Affected

gnu redhat

References

Official: NVD · CVE.org