CVE-2021-4216 Denial of service in mupdf
A division-by-zero flaw in MuPDF allows attackers to cause a denial of service via zero-width pages.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-4216?
CVE-2021-4216 is a medium-severity denial of service vulnerability in Artifex Mupdf, published on 26 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Floating point exception (division-by-zero) flaw was found in Mupdf for zero width pages in muraster.c. It is fixed in Mupdf-1.20.0-rc1 upstream.
Weakness: CWE-369
Which versions are affected by CVE-2021-4216?
It affects 1 product.
Linux distribution packages (3)
mupdf SUSE:Package Hub 15 SP3 | All versions | 1.12.0-bp153.2.6.1 |
mupdf openSUSE:Leap 15.3 | All versions | 1.12.0-bp153.2.6.1 |
mupdf openSUSE:Tumbleweed | All versions | 1.20.3-2.1 |
Products include Artifex Mupdf.
How do I fix CVE-2021-4216?
Upgrade to a fixed version.
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-2021-4216 being exploited?
There is no known exploitation of CVE-2021-4216 in the wild and no public exploit code.
Other vulnerabilities in Artifex Mupdf
Sources
Also known as DEBIAN-CVE-2021-4216, GHSA-fxg7-4q6m-p84h, UBUNTU-CVE-2021-4216, openSUSE-SU-2022:10125-1, openSUSE-SU-2024:12326-1.