What’s Vulnerable › Vulnerabilities
CVE-2020-14372
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-03-03 · updated 2026-06-17
- Weakness: CWE-184
Description
A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.
Affected products
- Fedoraproject Fedora: 33, 34
- grub2: before 2.06 — fixed in 2.06
- NetApp Cloud Backup: all versions
- NetApp ONTAP Select Deploy administration utility: all versions
- Red Hat Enterprise Linux: 7.0, 8.0
- RedHat Enterprise Linux Server Aus: 7.2, 7.3, 7.4, 7.6, 7.7, 8.2
- RedHat Enterprise Linux Server Eus: 7.6, 7.7, 8.1
- RedHat Enterprise Linux Server Tus: 7.4, 7.6, 7.7, 8.2
- RedHat Enterprise Linux Workstation: 7.0
How to fix
Upgrade to a fixed version: grub2 2.06. Check the vendor advisory for mitigations.
References
- https://access.redhat.com/security/vulnerabilities/RHSB-2021-003
- https://bugzilla.redhat.com/show_bug.cgi?id=1873150
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
- https://security.gentoo.org/glsa/202104-05
- https://security.netapp.com/advisory/ntap-20210416-0004/
- https://access.redhat.com/security/vulnerabilities/RHSB-2021-003
- https://bugzilla.redhat.com/show_bug.cgi?id=1873150
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
- https://security.gentoo.org/glsa/202104-05
- https://security.netapp.com/advisory/ntap-20210416-0004/
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