VYPR
Medium severity4.5NVD Advisory· Published Jul 6, 2022· Updated Jun 17, 2026

CVE-2021-3695

CVE-2021-3695

Description

A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.

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Affected products

67

Patches

Vulnerability mechanics

References

3

News mentions

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