CVE-2024-45781 | Grub2: fs/ufs: oob write in the heap

A flaw was found in grub2. When reading a symbolic link's name from a UFS filesystem, grub2 fails to validate the string length taken as an input. The lack of validation may lead to a heap out-of-bounds write, causing data integrity issues and eventually allowing an attacker to circumvent secure boot protections.

Published: 2025-02-18 Last update: 2026-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-45781 is rated Low Risk (28.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-45781

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-29 0.06% 0.02% -0.03%
2 2025-09-23 0.04% 0.06% +0.01%
3 2025-09-22 — 0.04% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-45781

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.7 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.8 5.9 [email protected]

Weakness enumeration for CVE-2024-45781

OS Trackers for CVE-2024-45781

vendor priority summary link
debian not yet assigned CVE-2024-45781 not yet assigned priority: Debian including 1 source packages (grub2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 1. https://security-tracker.debian.org/tracker/CVE-2024-45781
redhat medium — https://access.redhat.com/security/cve/CVE-2024-45781
suse medium CVE-2024-45781 severity moderate: SUSE including 399 source package names (2.0.4-5.8.146:grub2-2.06-150500.29.43.2, 2.0.4-5.8.146:grub2-i386-pc-2.06-150500.29.43.2, …), 1430 product×package rows across 293 product lines (Container suse/manager/5.0/x86_64/server, Container suse/sl-micro/6.0/base-os-container, … (293 product lines)): Fixed 1209, Known Affected 221. https://www.suse.com/security/cve/CVE-2024-45781/
ubuntu medium CVE-2024-45781 medium priority: Ubuntu including 3 source packages (grub2, grub2-signed, grub2-unsigned), 29 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 15, not-affected 8, ignored 6. https://ubuntu.com/security/CVE-2024-45781

Affected software / configurations for CVE-2024-45781

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2024-45781

cvelogic Threat Intelligence