CVE-2021-28855 Null dereference in n/a

Medium 5.5 Published 14 Apr 2021 Updated 26 Jan 2026

A crafted input file causes a NULL pointer dereference in Deark, leading to a denial of service.

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-2021-28855?

CVE-2021-28855 is a medium-severity 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 1.5.8, a specially crafted input file can cause a NULL pointer dereference in the dbuf_write function (src/deark-dbuf.c).

Weakness: CWE-476

Which versions are affected by CVE-2021-28855?

It affects 1 product.

Products include Entropymine Deark.

How do I fix CVE-2021-28855?

No fix has been published for CVE-2021-28855 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-28855 being exploited?

There is no known exploitation of CVE-2021-28855 in the wild and no public exploit code.

Sources

Also known as GHSA-648v-392v-p884.