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Vulnerability record · CVE-2021-3697 · published 6 July 2022

CVE-2021-3697: Gnu grub2 out-of-bounds write vulnerability

Gnu · Grub2

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.

7.0 CVSS 3.1 High EPSS 0.46% · top 62.8% CWE-787 · Out-of-bounds write
7.0CVSS 3.1 base score, v2 4.4
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
12Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

12 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1991687 Issue TrackingThird Party Advisory
https://security.gentoo.org/glsa/202209-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220930-0001/ Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1991687 Issue TrackingThird Party Advisory
https://security.gentoo.org/glsa/202209-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220930-0001/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3697), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.