🛡️ CVE-2025-61661 on Debian — grub2

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2025-61661 as tracked by Debian, for the package grub2. The fix is available in version 2.14-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with physical access to the device, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability high.

Weakness class

DEBIAN-CVE-2025-61661 is classified as CWE-131: Incorrect Buffer Size Calculation. The size computed for an allocation does not match what is later written into it, producing an overflow.

Affected software

DEBIAN-CVE-2025-61661 is recorded against 1 package.

  • grub2 (fixed in 2.14-1)

Timeline and source

Published on 18 November 2025 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2025-61661 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-11-18
Updated 2026-08-12
Modified 2026-08-04
Fix URL N/A

Affected Packages

Software From version Fixed in
grub2 — 2.14-1

Similar Threats

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