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CVE-2021-3697

7.0 · HIGH

A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap.

Published Jul 6, 2022CWE-787EPSS 0.46%

Overview

CVE-2021-3697 is a high-severity vulnerability. It was published on July 6, 2022 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

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=1991687Refsecurity.gentoo.org/glsa/202209-12Refsecurity.netapp.com/advisory/ntap-20220930-0001/Refbugzilla.redhat.com/show_bug.cgi?id=1991687Refsecurity.gentoo.org/glsa/202209-12Refsecurity.netapp.com/advisory/ntap-20220930-0001/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3697?

CVE-2021-3697 is a high-severity vulnerability. It was published on July 6, 2022 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2021-3697?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-3697?

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-2021-3697?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3697 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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