CVE-2020-21896 Use after free in n/a
Remote attackers can cause a denial of service in MuPDF by tricking users into opening a crafted PDF 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
- Available
What is CVE-2020-21896?
CVE-2020-21896 is a medium-severity use after free vulnerability in Artifex Mupdf, published on 22 Aug 2023. 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 Use After Free vulnerability in svg_dev_text_span_as_paths_defs function in source/fitz/svg-device.c in Artifex Software MuPDF 1.16.0 allows remote attackers to cause a denial of service via opening of a crafted PDF file.
Weakness: CWE-416
Which versions are affected by CVE-2020-21896?
It affects 1 product.
Products include Artifex Mupdf.
How do I fix CVE-2020-21896?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2020-21896 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-21896 exists.
Other vulnerabilities in Artifex Mupdf
Sources
Also known as DEBIAN-CVE-2020-21896, DLA-4278-1, GHSA-99jc-cxpj-3838, UBUNTU-CVE-2020-21896.