CVE-2020-21048 Denial of service in n/a

Medium 6.5 Published 14 Sep 2021 Updated 4 Aug 2024

Attackers can cause a denial of service in applications using libsixel by providing a crafted PNG file.

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-2020-21048?

CVE-2020-21048 is a medium-severity denial of service vulnerability in n/a, published on 14 Sep 2021. 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

An issue in the dither.c component of libsixel prior to v1.8.4 allows attackers to cause a denial of service (DOS) via a crafted PNG file.

Which versions are affected by CVE-2020-21048?

It affects 1 product.

Products include Saitoha Libsixel.

How do I fix CVE-2020-21048?

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-2020-21048 being exploited?

There is no known exploitation of CVE-2020-21048 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2020-21048, GHSA-j776-m8gg-r576, UBUNTU-CVE-2020-21048.