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Vulnerability record · CVE-2021-3930 · published 18 February 2022

CVE-2021-3930: Qemu vulnerability

Qemu · Qemu

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.

6.5 CVSS 3.1 Medium EPSS 0.34% · top 75.3% CWE-193 · CWE-193
6.5CVSS 3.1 base score, v2 2.1
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
10Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

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.

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

Affected products

10 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=2020588 Issue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202208-27 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220225-0007/ Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2020588 Issue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202208-27 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220225-0007/ Third Party Advisory

Track CVE-2021-3930 inside VULONE

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3930), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.