CVE-2025-0690
CVE-2025-0690 is a medium-severity vulnerability with a CVSS 3.x base score of 6.1. 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-787.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- EPSS exploit prediction: 1% (48th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-4377
- Weakness: CWE-787
- Published:
- Last modified:
Description
The read command is used to read the keyboard input from the user, while reads it keeps the input length in a 32-bit integer value which is further used to reallocate the line buffer to accept the next character. During this process, with a line big enough it's possible to make this variable to overflow leading to a out-of-bounds write in the heap based buffer. This flaw may be leveraged to corrupt grub's internal critical data and secure boot bypass is not discarded as consequence.
Frequently asked questions
- What is CVE-2025-0690?
- The read command is used to read the keyboard input from the user, while reads it keeps the input length in a 32-bit integer value which is further used to reallocate the line buffer to accept the next character. During this process, with a line big enough it's possible to make this variable to overflow leading to a out-of-bounds write in the heap based buffer. This flaw may be leveraged to corrupt grub's internal critical data and secure boot bypass is not discarded as consequence.
- How severe is CVE-2025-0690?
- CVE-2025-0690 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over physical access with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2025-0690 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-0690?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-0690 have an EU (EUVD) identifier?
- Yes. CVE-2025-0690 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-4377.
- When was CVE-2025-0690 published?
- CVE-2025-0690 was published on 2025-02-24 and last updated on 2026-06-30.
References
- https://access.redhat.com/errata/RHSA-2025:6990
- https://access.redhat.com/security/cve/CVE-2025-0690
- https://bugzilla.redhat.com/show_bug.cgi?id=2346123
- https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html
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