CVE-2021-46666 Denial of service in n/a
An attacker can cause a MariaDB application crash by exploiting mishandled query pushdown logic, requiring an upgrade to restore service availability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-46666?
CVE-2021-46666 is a medium-severity denial of service vulnerability in Mariadb Mariadb, published on 1 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
MariaDB before 10.6.2 allows an application crash because of mishandling of a pushdown from a HAVING clause to a WHERE clause.
Weakness: CWE-617
Which versions are affected by CVE-2021-46666?
3 open source packages ship an affected version, including mariadb, mariadb-min and mysql-client. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mariadb Bitnami | All versions | 10.2.39, 10.3.30, 10.4.20, 10.5.11, 10.6.2 |
mariadb-min Bitnami | All versions | 10.2.39, 10.3.30, 10.4.20, 10.5.11, 10.6.2 |
mysql-client Bitnami | All versions | 10.2.39, 10.3.30, 10.4.20, 10.5.11, 10.6.2 |
Products include Mariadb Mariadb.
How do I fix CVE-2021-46666?
Upgrade mariadb to a fixed version for your release line: 10.2.39, 10.3.30, 10.4.20 or 10.5.11.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-46666 being exploited?
There is no known exploitation of CVE-2021-46666 in the wild and no public exploit code.
Other vulnerabilities in Mariadb Mariadb
- CVE-2026-49261 MariaDB server has unsafe parameter handling in `wsrep_notify_cmd`
- CVE-2026-85746 MariaDB: Out-of-bound buffer write on in `ST_AsText` of nested GeometryCollections
- CVE-2026-85748 MariaDB: Use-after-free with a large number of SYS_REFCURSOR's
- CVE-2026-92262 MariaDB: Numerous issues caused by historical #mysql50# tablename encoding bypass.
- CVE-2023-26785 Code injection in n/a
Sources
Also known as AZL-8410, BIT-mariadb-2021-46666, BIT-mariadb-min-2021-46666, BIT-mysql-client-2021-46666, DEBIAN-CVE-2021-46666, GHSA-qhvg-j82m-w264 and 1 more.