CVE-2021-40633 Denial of service in n/a

High 8.8 Published 14 Jun 2022 Updated 4 Aug 2024

Remote attackers can cause denial of service via memory exhaustion by providing a malicious GIF file to applications using the giflib library.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2021-40633?

CVE-2021-40633 is a high-severity denial of service vulnerability in n/a, published on 14 Jun 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of memory exception or denial of service via a gif format file.

Weakness: CWE-401

Which versions are affected by CVE-2021-40633?

It affects 1 product.

Products include Giflib Project Giflib.

How do I fix CVE-2021-40633?

Upgrade to a fixed version.

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-2021-40633 being exploited?

There is no known exploitation of CVE-2021-40633 in the wild and no public exploit code.

Sources

Also known as ALPINE-CVE-2021-40633, AZL-41515, BELL-CVE-2021-40633, DEBIAN-CVE-2021-40633, ECHO-1988-db30-df19, GHSA-77hm-q3fv-fq9x and 9 more.