# CVE-2025-61661

## Summary

- **CVE ID:** CVE-2025-61661
- **Severity:** MEDIUM
- **CVSS Score:** 4.8 (CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H)
- **CWE:** CWE-131
- **Published:** Nov 18, 2025
- **Last Modified:** Sep 1, 2026

## 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.

## Affected Products

- GNU — grub2 (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.19%
- **EPSS Percentile:** 9.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._