CVE-2021-20225: Fedoraproject Fedora

Medium severity, CVSS 6.7. EPSS: 1% chance of exploitation in the next 30 days.

A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Affected products

• Fedoraproject Fedora: version 33 only; version 34 only
• GNU GRUB2: before 2.06 (fixed in 2.06)
• Netapp Ontap Select Deploy Administration Utility: affected versions not specified
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only
• Red Hat Enterprise Linux Server Aus: version 7.2 only; version 7.3 only; version 7.4 only; version 7.6 only; version 7.7 only; version 8.2 only
• Red Hat Enterprise Linux Server Eus: version 7.6 only; version 7.7 only; version 8.1 only
• Red Hat Enterprise Linux Server Tus: version 7.4 only; version 7.6 only; version 7.7 only; version 8.2 only
• Red Hat Enterprise Linux Workstation: version 7.0 only

Published 2021-03-03. Last modified 2026-06-17.