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CVE-2021-3418

MEDIUM
6.4
CVSS Score
Published: March 15, 2021 at 09:17 PM UTC
Updated: June 17, 2026 at 04:05 AM UTC
1 product affected across 1 vendorGRUB2

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Severity
MEDIUM6.4
Exploit prediction
EPSS 0.5%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GRUB2· Gnu
95%
v < 2.06
Vendor states this is fixed in 2.06 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=1933757

CVSS

6.4MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
HIGH
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-281

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