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CVE-2025-0677

6.4 · MEDIUM

A flaw was found in grub2.

Published Feb 19, 2025CWE-787EPSS 0.33%

Overview

CVE-2025-0677 is a medium-severity vulnerability. It was published on February 19, 2025 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A flaw was found in grub2. When performing a symlink lookup, the grub's UFS module checks the inode's data size to allocate the internal buffer to read the file content, however, it fails to check if the symlink data size has overflown. When this occurs, grub_malloc() may be called with a smaller value than needed. When further reading the data from the disk into the buffer, the grub_ufs_lookup_symlink() function will write past the end of the allocated size. An attack can leverage this by crafting a malicious filesystem, and as a result, it will corrupt data stored in the heap, allowing for arbitrary code execution used to by-pass secure boot mechanisms.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2025:16154Refaccess.redhat.com/errata/RHSA-2025:6990Refaccess.redhat.com/security/cve/CVE-2025-0677Refbugzilla.redhat.com/show_bug.cgi?id=2346116Reflists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-0677?

CVE-2025-0677 is a medium-severity vulnerability. It was published on February 19, 2025 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

How severe is CVE-2025-0677?

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-0677?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-0677?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-0677 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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