CVE-2021-3697: GNU GRUB2

High severity, CVSS 7.0. EPSS: 0.5% chance of exploitation in the next 30 days.

A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.

Affected products

GNU GRUB2: from 2.00, before 2.12 (fixed in 2.12)
Red Hat Codeready Linux Builder: affected versions not specified
Red Hat Developer Tools: version 1.0 only
Red Hat Enterprise Linux: version 8.0 only; version 8.1 only; version 8.4 only; version 9.0 only
Red Hat Enterprise Linux Eus: version 8.2 only; version 8.4 only; version 8.6 only; version 9.0 only
Red Hat Enterprise Linux For Power Little Endian: version 8.0 only; version 9.0 only
Red Hat Enterprise Linux For Power Little Endian Eus: version 8.2 only; version 8.4 only; version 8.6 only; version 9.0 only
Red Hat Enterprise Linux Server Aus: version 8.2 only; version 8.4 only; version 8.6 only
Red Hat Enterprise Linux Server For Power Little Endian Update Services For SAP Solutions: version 8.1 only; version 8.2 only; version 8.4 only; version 8.6 only; version 9.0 only
Red Hat Enterprise Linux Server Tus: version 8.2 only; version 8.4 only; version 8.6 only
Red Hat Openshift: version 3.0 only
Red Hat Openshift Container Platform: version 4.6 only; version 4.9 only; version 4.10 only

Published 2022-07-06. Last modified 2026-06-17.