CVE-2021-3930

Name: CVE-2021-3930
Creator: NVD / NIST
Published: 2022-02-18T18:15:09.683+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2021-3930 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.34%

25.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qemu	Qemu	< 6.2.0
Redhat	Codeready Linux Builder	8.0
Redhat	Codeready Linux Builder For Ibm Z Systems	8.0
Redhat	Codeready Linux Builder For Power Little Endian	8.0
Redhat	Openstack	10
Redhat	Openstack	13
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux Advanced Virtualization Eus	8.4
Redhat	Enterprise Linux For Ibm Z Systems	8.0
Redhat	Enterprise Linux For Power Little Endian	8.0
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=2020588Issue Tracking, Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory
https://security.netapp.com/advisory/ntap-20220225-0007/Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2020588Issue Tracking, Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory
https://security.netapp.com/advisory/ntap-20220225-0007/Third Party Advisory

Timeline

Published: Feb 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3930?

How severe is CVE-2021-3930?

CVE-2021-3930 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3930?

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-2021-3930?

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

Scan your code now

Source: NVD / NIST