Vulnerability in Gnu Grub2
CVE-2025-61663
A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the normal command is not properly unregistered when the module is unloaded. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability. Impact on the data integrity and confidentiality is also not discarded.
EPSS: 0.001 (2.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
Affected products
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking)
Frequently asked questions
- What is CVE-2025-61663?
- CVE-2025-61663 is a medium-severity vulnerability in Gnu Grub2, classified under CWE-825. CVSS score: 4.9/10. Published 2025-11-18.
- How severe is CVE-2025-61663?
- Medium severity. CVSS v3 base score is 4.9 out of 10.