CVE-2021-20176 Denial of service in ImageMagick
An attacker can cause a denial of service in ImageMagick by submitting a crafted file that triggers a divide-by-zero error.
- 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-2021-20176?
CVE-2021-20176 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 5 Feb 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
A divide-by-zero flaw was found in ImageMagick 6.9.11-57 and 7.0.10-57 in gem.c. This flaw allows an attacker who submits a crafted file that is processed by ImageMagick to trigger undefined behavior through a division by zero. The highest threat from this vulnerability is to system availability.
Weakness: CWE-369
Which versions are affected by CVE-2021-20176?
It affects 2 products.
Linux distribution packages (6)
ImageMagick SUSE:Linux Enterprise Module for Desktop Applications 15 SP2 | All versions | 7.0.7.34-10.18.1 |
ImageMagick SUSE:Linux Enterprise Module for Desktop Applications 15 SP3 | All versions | 7.0.7.34-10.18.1 |
ImageMagick SUSE:Linux Enterprise Module for Development Tools 15 SP2 | All versions | 7.0.7.34-10.18.1 |
ImageMagick SUSE:Linux Enterprise Module for Development Tools 15 SP3 | All versions | 7.0.7.34-10.18.1 |
ImageMagick openSUSE:Leap 15.2 | All versions | 7.0.7.34-lp152.12.18.1 |
ImageMagick openSUSE:Leap 15.3 | All versions | 7.0.7.34-10.18.1 |
Products include Debian Debian Linux, Imagemagick Imagemagick.
How do I fix CVE-2021-20176?
Apply the vendor's patch.
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-2021-20176 being exploited?
There is no known exploitation of CVE-2021-20176 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as CVE-2021-20242, DEBIAN-CVE-2021-20176, GHSA-rjh9-hq94-crmg, JLSEC-2026-877, SUSE-SU-2021:3996-1, UBUNTU-CVE-2021-20176 and 2 more.