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    CVE-2021-3418

    If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06 and upstream and distributions using the shim_lock mechanism.

    Published:Mar 2, 2021
    Last Modified:Nov 21, 2024
    EPS:Mar 15, 2021
    EPSS Score:0.00064
    CVSS Score:6.4

    Affected Products

    Vendor
    Gnu
    Product
    Grub2

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2025-0684 (CVSS 6.4) — A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs mod…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High