CVE-2021-46662 Denial of service in n/a
An attacker can cause a MariaDB application crash by executing a specific UPDATE statement with a nested subquery, leading to denial of service.
- 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-2021-46662?
CVE-2021-46662 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 through 10.5.9 allows a set_var.cc application crash via certain uses of an UPDATE statement in conjunction with a nested subquery.
Which versions are affected by CVE-2021-46662?
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 | From 10.3.0 | 10.3.32, 10.4.22, 10.5.13, 10.6.5 |
mariadb-min Bitnami | From 10.3.0 | 10.3.32, 10.4.22, 10.5.13, 10.6.5 |
mysql-client Bitnami | From 10.3.0 | 10.3.32, 10.4.22, 10.5.13, 10.6.5 |
Products include Mariadb Mariadb.
How do I fix CVE-2021-46662?
Upgrade mariadb to a fixed version for your release line: 10.3.32, 10.4.22, 10.5.13 or 10.6.5.
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-2021-46662 being exploited?
There is no known exploitation of CVE-2021-46662 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 ALPINE-CVE-2021-46662, AZL-8406, BIT-mariadb-2021-46662, BIT-mariadb-min-2021-46662, BIT-mysql-client-2021-46662, DEBIAN-CVE-2021-46662 and 2 more.