CVE-2021-3392

Name: CVE-2021-3392
Creator: NVD / NIST
Published: 2021-03-23T20:15:13.44+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.2/10EPSS 0.45%

Last modified Jun 17, 2026

CVE-2021-3392 is a low-severity vulnerability rated 3.2/10 on the CVSS scale. A use-after-free flaw was found in the MegaRAID emulator of QEMU. This issue occurs while processing SCSI I/O requests in the case of an error mptsas_free_request() that does not dequeue the request object 'req' from a pending requests queue. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

Description

A use-after-free flaw was found in the MegaRAID emulator of QEMU. This issue occurs while processing SCSI I/O requests in the case of an error mptsas_free_request() that does not dequeue the request object 'req' from a pending requests queue. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. Versions between 2.10.0 and 5.2.0 are potentially affected.

Metrics

CVSS 3.1

3.2/10

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

EPSS Probability

0.45%

35.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qemu	Qemu	>= 2.10.0, <= 5.2.0
Fedoraproject	Fedora	33
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0

References

https://bugs.launchpad.net/qemu/+bug/1914236Exploit, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1924042Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.htmlThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210507-0001/Third Party Advisory
https://bugs.launchpad.net/qemu/+bug/1914236Exploit, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1924042Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.htmlThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210507-0001/Third Party Advisory

Timeline

Published: Mar 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3392?

How severe is CVE-2021-3392?

CVE-2021-3392 has a CVSS score of 3.2/10 (LOW severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3392?

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-2021-3392?

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

Scan your code now

Source: NVD / NIST