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CVE-2021-3696

4.5 · MEDIUM

A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader.

Published Jul 6, 2022CWE-787EPSS 0.47%

Overview

CVE-2021-3696 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 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.

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=1991686Refsecurity.gentoo.org/glsa/202209-12Refsecurity.netapp.com/advisory/ntap-20220930-0001/Refbugzilla.redhat.com/show_bug.cgi?id=1991686Refsecurity.gentoo.org/glsa/202209-12Refsecurity.netapp.com/advisory/ntap-20220930-0001/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3696?

CVE-2021-3696 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-2021-3696?

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-2021-3696?

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-2021-3696?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3696 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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