CVE-2020-21844 Memory corruption in n/a

High 8.8 Published 17 May 2021 Updated 9 Jul 2026

A memory corruption vulnerability in GNU LibreDWG allows remote attackers to execute arbitrary code via a crafted DWG 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: None listed

What is CVE-2020-21844?

CVE-2020-21844 is a high-severity memory corruption vulnerability in Gnu Libredwg, published on 17 May 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

GNU LibreDWG 0.10 is affected by: memcpy-param-overlap. The impact is: execute arbitrary code (remote). The component is: read_2004_section_header ../../src/decode.c:2580.

Which versions are affected by CVE-2020-21844?

It affects 1 product.

Products include Gnu Libredwg.

How do I fix CVE-2020-21844?

No fix has been published for CVE-2020-21844 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-21844 being exploited?

There is no known exploitation of CVE-2020-21844 in the wild and no public exploit code.

All Gnu Libredwg vulnerabilities

Sources

Also known as GHSA-4f2c-7x9q-gqpq.