CVE-2025-54771
CVE-2025-54771 is a medium-severity vulnerability with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-825.
Key facts
- Severity: Medium (CVSS 3.x base score 4.9)
- EPSS exploit prediction: 0% (3rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-198082
- Weakness: CWE-825
- Published:
- Last modified:
Description
A use-after-free vulnerability has been identified in the GNU GRUB (Grand Unified Bootloader). The flaw occurs because the file-closing process incorrectly retains a memory pointer, leaving an invalid reference to a file system structure. An attacker could exploit this vulnerability to cause grub to crash, leading to a Denial of Service. Possible data integrity or confidentiality compromise is not discarded.
Frequently asked questions
- What is CVE-2025-54771?
- A use-after-free vulnerability has been identified in the GNU GRUB (Grand Unified Bootloader). The flaw occurs because the file-closing process incorrectly retains a memory pointer, leaving an invalid reference to a file system structure. An attacker could exploit this vulnerability to cause grub to crash, leading to a Denial of Service. Possible data integrity or confidentiality compromise is not discarded.
- How severe is CVE-2025-54771?
- CVE-2025-54771 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2025-54771 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-54771?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-54771 have an EU (EUVD) identifier?
- Yes. CVE-2025-54771 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198082.
- When was CVE-2025-54771 published?
- CVE-2025-54771 was published on 2025-11-18 and last updated on 2026-06-30.
References
- https://access.redhat.com/security/cve/CVE-2025-54771
- https://bugzilla.redhat.com/show_bug.cgi?id=2413823
- https://lists.gnu.org/archive/html/grub-devel/2025-11/msg00155.html
- http://www.openwall.com/lists/oss-security/2025/11/18/3
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