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CVE-2021-3695

4.5 · MEDIUM

A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area.

Published Jul 6, 2022CWE-787EPSS 0.46%

Overview

CVE-2021-3695 is a medium-severity vulnerability. It was published on July 6, 2022 and has a CVSS 3.1 base score of 4.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.redhat.com/show_bug.cgi?id=1991685Refsecurity.gentoo.org/glsa/202209-12Refsecurity.netapp.com/advisory/ntap-20220930-0001/Refbugzilla.redhat.com/show_bug.cgi?id=1991685Refsecurity.gentoo.org/glsa/202209-12Refsecurity.netapp.com/advisory/ntap-20220930-0001/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3695?

CVE-2021-3695 is a medium-severity vulnerability. It was published on July 6, 2022 and has a CVSS 3.1 base score of 4.5 (MEDIUM).

How severe is CVE-2021-3695?

This vulnerability has a CVSS 3.1 base score of 4.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-3695?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-3695?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3695 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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