What is CVE-2021-46668?

CVE-2021-46668 is a medium-severity vulnerability in Mariadb, classified under Uncontrolled Resource Consumption. CVSS score: 5.5/10. Published 2022-02-01.

How severe is CVE-2021-46668?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Resource exhaustion in Mariadb

CVE-2021-46668

MariaDB through 10.5.9 allows an application crash via certain long SELECT DISTINCT statements that improperly interact with storage-engine resource limitations for temporary data structures.

Vulnerability class: DoS (Denial of Service)

Published 2022-02-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (31.6th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Mariadb
Fedoraproject Fedora — versions 34, 35, 36

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

jira.mariadb.org/browse/MDEV-25787 (Exploit, Patch, Issue Tracking, Vendor Advisory)
security.netapp.com/advisory/ntap-20220221-0002/ (Third Party Advisory)
mariadb.com/kb/en/security/ (Patch, Vendor Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)

Frequently asked questions

What is CVE-2021-46668?: CVE-2021-46668 is a medium-severity vulnerability in Mariadb, classified under Uncontrolled Resource Consumption. CVSS score: 5.5/10. Published 2022-02-01.
How severe is CVE-2021-46668?: Medium severity. CVSS v3 base score is 5.5 out of 10.