Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2021-20221

6.0 · MEDIUM

An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of QEMU up to and including qemu 4.2.0on aarch64 platform.

Published May 13, 2021CWE-125EPSS 0.33%

Overview

CVE-2021-20221 is a medium-severity vulnerability. It was published on May 13, 2021 and has a CVSS 3.1 base score of 6.0 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.0, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of QEMU up to and including qemu 4.2.0on aarch64 platform. The issue occurs because while writing an interrupt ID to the controller memory area, it is not masked to be 4 bits wide. It may lead to the said issue while updating controller state fields and their subsequent processing. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

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

Refwww.openwall.com/lists/oss-security/2021/02/05/1Refbugzilla.redhat.com/show_bug.cgi?id=1924601Reflists.debian.org/debian-lts-announce/2021/02/msg00024.htmlReflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.netapp.com/advisory/ntap-20210708-0005/Refwww.openwall.com/lists/oss-security/2021/02/05/1Refbugzilla.redhat.com/show_bug.cgi?id=1924601Reflists.debian.org/debian-lts-announce/2021/02/msg00024.htmlReflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.netapp.com/advisory/ntap-20210708-0005/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20221?

CVE-2021-20221 is a medium-severity vulnerability. It was published on May 13, 2021 and has a CVSS 3.1 base score of 6.0 (MEDIUM).

How severe is CVE-2021-20221?

This vulnerability has a CVSS 3.1 base score of 6.0, 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-2021-20221?

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-2021-20221?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20221 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.

Related MEDIUM CVEs from 2021

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999