CVE-2021-3697
7.0
HIGH
CVSS 3.1
EPSS 0.07%
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.
How to fix CVE-2021-3697
To remediate CVE-2021-3697, upgrade the affected package to a fixed version below.
- —upgrade to 2.06-r3 or later
- —upgrade to 2.06-3~deb11u1 or later
Is CVE-2021-3697 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.06-r3
- from 0, < 2.06-3~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |