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CVE-2021-20239

3.3 · LOW

A flaw was found in the Linux kernel in versions before 5.4.92 in the BPF protocol.

Published May 28, 2021CWE-822EPSS 0.26%

Overview

CVE-2021-20239 is a low-severity vulnerability. It was published on May 28, 2021 and has a CVSS 3.1 base score of 3.3 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A flaw was found in the Linux kernel in versions before 5.4.92 in the BPF protocol. This flaw allows an attacker with a local account to leak information about kernel internal addresses. The highest threat from this vulnerability is to confidentiality.

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=1923636Refbugzilla.redhat.com/show_bug.cgi?id=1923636

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20239?

CVE-2021-20239 is a low-severity vulnerability. It was published on May 28, 2021 and has a CVSS 3.1 base score of 3.3 (LOW).

How severe is CVE-2021-20239?

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-20239?

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-2021-20239?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20239 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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