CVE-2021-3696

Description

A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it's very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12.

How to fix CVE-2021-3696

To remediate CVE-2021-3696, upgrade the affected package to a fixed version below.

• —upgrade to 2.06-3~deb11u1 or later

Is CVE-2021-3696 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 2.06-3~deb11u1

CVSS scores

References (1)

• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-3696