CVE-2021-3546

Name: CVE-2021-3546
Creator: NVD / NIST
Published: 2021-06-02T14:15:11.12+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.46%

Last modified Jun 17, 2026

CVE-2021-3546 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. An out-of-bounds write vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. The flaw occurs while processing the 'VIRTIO_GPU_CMD_GET_CAPSET' command from the guest. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

Description

An out-of-bounds write vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. The flaw occurs while processing the 'VIRTIO_GPU_CMD_GET_CAPSET' command from the guest. It could allow a privileged guest user to crash the QEMU process on the host, resulting in a denial of service condition, or potential code execution with the privileges of the QEMU process.

Metrics

CVSS 3.1

8.2/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

0.46%

36.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qemu	Qemu	<= 6.0.0
Debian	Debian Linux	11.0

References

http://www.openwall.com/lists/oss-security/2021/05/31/1Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1958978Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory
https://security.netapp.com/advisory/ntap-20210720-0008/Third Party Advisory
https://www.debian.org/security/2021/dsa-4980Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/31/1Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1958978Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory
https://security.netapp.com/advisory/ntap-20210720-0008/Third Party Advisory
https://www.debian.org/security/2021/dsa-4980Third Party Advisory

Timeline

Published: Jun 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3546?

How severe is CVE-2021-3546?

CVE-2021-3546 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3546?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3546?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST