What is CVE-2025-61661?

CVE-2025-61661 is a medium-severity vulnerability in Gnu Grub2, classified under Incorrect Calculation of Buffer Size. CVSS score: 4.8/10. Published 2025-11-18.

How severe is CVE-2025-61661?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Gnu Grub2

CVE-2025-61661

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 inconsis…

EPSS: 0.000 (8.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.

Affected products

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size

References

access.redhat.com/security/cve/CVE-2025-61661 (vdb-entry, x_refsource_REDHAT)
RHBZ#2413827 (issue-tracking, x_refsource_REDHAT)

Frequently asked questions

What is CVE-2025-61661?: CVE-2025-61661 is a medium-severity vulnerability in Gnu Grub2, classified under Incorrect Calculation of Buffer Size. CVSS score: 4.8/10. Published 2025-11-18.
How severe is CVE-2025-61661?: Medium severity. CVSS v3 base score is 4.8 out of 10.