CVE-2025-61661

MEDIUM EPSS 6.5%

Published Nov 18, 20257mo ago · Modified Jun 17, 20261w ago

4.8 CVSS 3.1

Medium

Published Nov 18, 2025 7mo ago

Last Modified Jun 17, 2026 1w ago

Description

A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.

CVSS Details

Base Score

4.8

Exploitability

0.5

Impact

4.2

Vector string

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

Attack Vector Physical

Attack Complexity High

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality None

Integrity Low

Availability High

Threat Intelligence

EPSS Exploit Probability

6.5% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-131

References 3

openwall.com http://www.openwall.com/lists/oss-security/2025/11/18/8
access.redhat.com https://access.redhat.com/security/cve/CVE-2025-61661
bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2413827

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.