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CVE-2021-20285

6.6 · MEDIUM

A flaw was found in upx canPack in p_lx_elf.cpp in UPX 3.96.

Published Mar 26, 2021CWE-119EPSS 0.75%

Overview

CVE-2021-20285 is a medium-severity vulnerability. It was published on March 26, 2021 and has a CVSS 3.1 base score of 6.6 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.6, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

A flaw was found in upx canPack in p_lx_elf.cpp in UPX 3.96. This flaw allows attackers to cause a denial of service (SEGV or buffer overflow and application crash) or possibly have unspecified other impacts via a crafted ELF. The highest threat from this vulnerability is to system availability.

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=1937787GitHubgithub.com/upx/upx/issues/421Refbugzilla.redhat.com/show_bug.cgi?id=1937787GitHubgithub.com/upx/upx/issues/421

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20285?

CVE-2021-20285 is a medium-severity vulnerability. It was published on March 26, 2021 and has a CVSS 3.1 base score of 6.6 (MEDIUM).

How severe is CVE-2021-20285?

This vulnerability has a CVSS 3.1 base score of 6.6, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-20285?

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-2021-20285?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20285 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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