What’s Vulnerable › Vulnerabilities

CVE-2020-25647

• Severity: high (CVSS 7.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% 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-787

Description

A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. 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 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://bugzilla.redhat.com/show_bug.cgi?id=1886936
• 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-20220325-0001/
• https://bugzilla.redhat.com/show_bug.cgi?id=1886936
• 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-20220325-0001/

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