CVE-2021-23180 Null dereference in htmldoc

High 7.8 Published 2 Mar 2022 Updated 3 Aug 2024

A null pointer dereference in htmldoc allows attackers to execute arbitrary code or cause denial of service via crafted input.

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: Available

What is CVE-2021-23180?

CVE-2021-23180 is a high-severity vulnerability in htmldoc, published on 2 Mar 2022. 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

A flaw was found in htmldoc in v1.9.12 and before. Null pointer dereference in file_extension(),in file.c may lead to execute arbitrary code and denial of service.

Weakness: CWE-476

Which versions are affected by CVE-2021-23180?

It affects 1 product.

Products include Htmldoc Project Htmldoc.

How do I fix CVE-2021-23180?

Apply the vendor's patch.

Is CVE-2021-23180 being exploited?

There is no known exploitation of CVE-2021-23180 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2021-23180, GHSA-77xx-wx8p-7pfj, UBUNTU-CVE-2021-23180, USN-5198-1.