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CVE-2021-3713

7.4 · HIGH

An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions prior to 6.2.0-rc0.

Published Aug 25, 2021CWE-787EPSS 0.57%

Overview

CVE-2021-3713 is a high-severity vulnerability. It was published on August 25, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions prior to 6.2.0-rc0. The device uses the guest supplied stream number unchecked, which can lead to out-of-bounds access to the UASDevice->data3 and UASDevice->status3 fields. A malicious guest user could use this flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the host.

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=1994640Reflists.debian.org/debian-lts-announce/2021/09/msg00000.htmlReflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.gentoo.org/glsa/202208-27Refsecurity.netapp.com/advisory/ntap-20210923-0006/Refwww.debian.org/security/2021/dsa-4980Refbugzilla.redhat.com/show_bug.cgi?id=1994640Reflists.debian.org/debian-lts-announce/2021/09/msg00000.htmlReflists.debian.org/debian-lts-announce/2022/09/msg00008.htmlRefsecurity.gentoo.org/glsa/202208-27

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3713?

CVE-2021-3713 is a high-severity vulnerability. It was published on August 25, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2021-3713?

This vulnerability has a CVSS 3.1 base score of 7.4, 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-2021-3713?

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-2021-3713?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3713 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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