{"id":"CVE-2025-61661","title":"A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component","summary":"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 incons…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","cwe":["CWE-131"],"published":"2025-11-18","updated":"2026-06-25","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-61661","references":[{"url":"https://access.redhat.com/security/cve/CVE-2025-61661","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2413827","label":"secalert@redhat.com"},{"url":"http://www.openwall.com/lists/oss-security/2025/11/18/8","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00194,"epssPercentile":0.09373,"ingestedAt":"2026-06-29T13:24:34.606Z","slug":"CVE-2025-61661","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}