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CVE-2021-20255

5.5 · MEDIUM

A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator of QEMU.

Published Mar 9, 2021CWE-835EPSS 0.41%

Overview

CVE-2021-20255 is a medium-severity vulnerability. It was published on March 9, 2021 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a denial of service. 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=1930646Reflists.debian.org/debian-lts-announce/2021/04/msg00009.htmlRefruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Feepro100_stackoverflow1Refsecurity.netapp.com/advisory/ntap-20210507-0003/Refwww.openwall.com/lists/oss-security/2021/02/25/1Refbugzilla.redhat.com/show_bug.cgi?id=1930646Reflists.debian.org/debian-lts-announce/2021/04/msg00009.htmlRefruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Feepro100_stackoverflow1Refsecurity.netapp.com/advisory/ntap-20210507-0003/Refwww.openwall.com/lists/oss-security/2021/02/25/1

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20255?

CVE-2021-20255 is a medium-severity vulnerability. It was published on March 9, 2021 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-20255?

This vulnerability has a CVSS 3.1 base score of 5.5, 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-2021-20255?

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-2021-20255?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20255 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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