CVE-2021-31239 Denial of service in n/a

High 7.5 Published 9 May 2023 Updated 14 Oct 2026

A remote attacker can cause a denial of service in SQLite via the appendvfs.c function, affecting applications using this library.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2021-31239?

CVE-2021-31239 is a high-severity denial of service vulnerability in Sqlite Sqlite, published on 9 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue found in SQLite SQLite3 v.3.35.4 that allows a remote attacker to cause a denial of service via the appendvfs.c function.

Weakness: CWE-125

Which versions are affected by CVE-2021-31239?

1 open source package ship an affected version, including sqlite. It affects 1 product.

Package	Affected	Fixed in
`sqlite` Bitnami	From `3.35.4`	`3.35.5`

Products include Sqlite Sqlite.

How do I fix CVE-2021-31239?

Upgrade sqlite to 3.35.5 or later.

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-2021-31239 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-31239 exists.

All Sqlite Sqlite vulnerabilities

Sources

Also known as BIT-sqlite-2021-31239, DEBIAN-CVE-2021-31239, GHSA-mv5m-45gv-gh97.