CVE-2021-28856 Denial of service in n/a

Medium 5.5 Published 14 Apr 2021 Updated 26 Jan 2026

A division by zero error in Deark allows attackers to cause a denial of service via a specially crafted input file.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-28856?

CVE-2021-28856 is a medium-severity denial of service vulnerability in n/a, published on 14 Apr 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

In Deark before v1.5.8, a specially crafted input file can cause a division by zero in (src/fmtutil.c) because of the value of pixelsize.

Weakness: CWE-369

Which versions are affected by CVE-2021-28856?

It affects 1 product.

Products include Entropymine Deark.

How do I fix CVE-2021-28856?

No fix has been published for CVE-2021-28856 yet. Limit exposure of the affected software until one is available.

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-2021-28856 being exploited?

There is no known exploitation of CVE-2021-28856 in the wild and no public exploit code.

Sources

Also known as GHSA-f68w-mw2g-j2g2.